chore(deps): update lxml requirement from >=4,<6 to >=4,<7 (#835)

Updates the requirements on [lxml](https://github.com/lxml/lxml) to
permit the latest version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/lxml/lxml/blob/master/CHANGES.txt">lxml's
changelog</a>.</em></p>
<blockquote>
<h1>6.0.0 (2025-06-26)</h1>
<h2>Features added</h2>
<ul>
<li>
<p>GH#463: <code>lxml.html.diff</code> is faster and provides
structurally better diffs.
Original patch by Steven Fernandez.</p>
</li>
<li>
<p>GH#405: The factories <code>Element</code> and
<code>ElementTree</code> can now be used in type hints.</p>
</li>
<li>
<p>GH#448: Parsing from <code>memoryview</code> and other buffers is
supported to allow zero-copy parsing.</p>
</li>
<li>
<p>GH#437: <code>lxml.html.builder</code> was missing several HTML5 tag
names.
Patch by Nick Tarleton.</p>
</li>
<li>
<p>GH#458: <code>CDATA</code> can now be written into the incremental
<code>xmlfile()</code> writer.
Original patch by Lane Shaw.</p>
</li>
<li>
<p>A new parser option <code>decompress=False</code> was added that
controls the automatic
input decompression when using libxml2 2.15.0 or later. Disabling this
option
by default will effectively prevent decompression bombs when handling
untrusted
input. Code that depends on automatic decompression must enable this
option.
Note that libxml2 2.15.0 was not released yet, so this option currently
has no
effect but can already be used.</p>
</li>
<li>
<p>The set of compile time / runtime supported libxml2 feature names is
available as
<code>etree.LIBXML_COMPILED_FEATURES</code> and
<code>etree.LIBXML_FEATURES</code>.
This currently includes
<code>catalog</code>, <code>ftp</code>, <code>html</code>,
<code>http</code>, <code>iconv</code>, <code>icu</code>,
<code>lzma</code>, <code>regexp</code>, <code>schematron</code>,
<code>xmlschema</code>, <code>xpath</code>, <code>zlib</code>.</p>
</li>
</ul>
<h2>Bugs fixed</h2>
<ul>
<li>
<p>GH#353: Predicates in <code>.find*()</code> could mishandle tag
indices if a default namespace is provided.
Original patch by Luise K.</p>
</li>
<li>
<p>GH#272: The <code>head</code> and <code>body</code> properties of
<code>lxml.html</code> elements failed if no such element
was found.  They now return <code>None</code> instead.
Original patch by FVolral.</p>
</li>
<li>
<p>Tag names provided by code (API, not data) that are longer than
<code>INT_MAX</code>
could be truncated or mishandled in other ways.</p>
</li>
<li>
<p><code>.text_content()</code> on <code>lxml.html</code> elements
accidentally returned a &quot;smart string&quot;
without additional information.  It now returns a plain string.</p>
</li>
<li>
<p>LP#2109931: When building lxml with coverage reporting, it now
disables the <code>sys.monitoring</code>
support due to the lack of support in <a
href="https://redirect.github.com/nedbat/coveragepy/issues/1790">nedbat/coveragepy#1790</a></p>
</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/lxml/lxml/commit/2a67034bc21150e9cc14500f65c41fa4e9d51c9b"><code>2a67034</code></a>
Prepare release of 6.0.0.</li>
<li><a
href="https://github.com/lxml/lxml/commit/e0b4e021825249923b3421abba9e94d03b3cf366"><code>e0b4e02</code></a>
Update changelog.</li>
<li><a
href="https://github.com/lxml/lxml/commit/d3f4dcf6899b82984d24cb20519c23e3c127fc17"><code>d3f4dcf</code></a>
Build: Upgrade libxml2 to latest 2.14.4.</li>
<li><a
href="https://github.com/lxml/lxml/commit/014e51cce37e376aa074c908f0605cd9f378fc09"><code>014e51c</code></a>
Build: Add Windows arm64 wheel builds (<a
href="https://redirect.github.com/lxml/lxml/issues/465">GH-465</a>)</li>
<li><a
href="https://github.com/lxml/lxml/commit/d3914dcb6aa3dd05979e2321b17e269744aebae5"><code>d3914dc</code></a>
Only use &quot;xmlCtxtIsStopped()&quot; from libxml2 2.15.0 on since it
fails to cover ...</li>
<li><a
href="https://github.com/lxml/lxml/commit/6e413902754dc0b46e89bcab3fdcfb5207095e22"><code>6e41390</code></a>
Avoid reading the deprecated &quot;disableSAX&quot; attribute of
&quot;xmlParserCtxt&quot;.</li>
<li><a
href="https://github.com/lxml/lxml/commit/f85da81b1d19440d2be3d295bd7b91f2871a9cfc"><code>f85da81</code></a>
Use newer &quot;language_level=3&quot; in ElementPath module.</li>
<li><a
href="https://github.com/lxml/lxml/commit/787315eb54b9c8efacd3400f801e22e41e4142d0"><code>787315e</code></a>
Build: bump pypa/cibuildwheel in the github-actions group (<a
href="https://redirect.github.com/lxml/lxml/issues/464">#464</a>)</li>
<li><a
href="https://github.com/lxml/lxml/commit/fb3adb1dce9afd699f7ab0d4b4866f1c0b8191b2"><code>fb3adb1</code></a>
Readme: Add project income report for 2024.</li>
<li><a
href="https://github.com/lxml/lxml/commit/8e61a757c820dc412458788121cd83425d7f6630"><code>8e61a75</code></a>
Fit cached tuple more nicely into cachelines.</li>
<li>Additional commits viewable in <a
href="https://github.com/lxml/lxml/compare/lxml-4.0.0...lxml-6.0.0">compare
view</a></li>
</ul>
</details>
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pyproject.toml

@@ -73,7 +73,7 @@ py-serializable =  "^2.0.0"
 sortedcontainers = "^2.4.0"
 license-expression = "^30"
 jsonschema = { version = "^4.18", extras=['format'], optional=true }
-lxml = { version=">=4,<6", optional=true }
+lxml = { version=">=4,<7", optional=true }
 
 [tool.poetry.extras]
 validation = ["jsonschema", "lxml"]