Update sybil requirement from <9,>=6.1.1 to >=6.1.1,<10 (#327)

Updates the requirements on [sybil](https://github.com/simplistix/sybil)
to permit the latest version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/simplistix/sybil/blob/master/CHANGELOG.rst">sybil's
changelog</a>.</em></p>
<blockquote>
<h2>9.0.0 (12 Nov 2024)</h2>
<ul>
<li>
<p>Retire <code>Document.find_region_sources()</code> in favour of using
a
:class:<code>~sybil.parsers.abstract.lexers.BlockLexer</code>.
See the :ref:<code>updated example
&lt;parser-from-scratch&gt;</code>.</p>
</li>
<li>
<p>Better error messages when lexing fails to find the end of a
block.</p>
</li>
<li>
<p>Improved documentation.</p>
</li>
</ul>
<h2>8.0.1 (30 Oct 2024)</h2>
<ul>
<li>
<p>Better error message when skip arguments are malformed.</p>
</li>
<li>
<p>Remove unused constant that caused problems with development releases
of pytest.</p>
</li>
</ul>
<h2>8.0.0 (20 Sep 2024)</h2>
<ul>
<li>
<p>Drop Python 3.8 support.</p>
</li>
<li>
<p>Internal code tidying.</p>
</li>
</ul>
<p>Thanks to Adam Dangoor for the work on these!</p>
<h2>7.1.1 (16 Sep 2024)</h2>
<ul>
<li>Fix bug that broke docstring collection where a method had an
:any:<code>ellipsis &lt;Ellipsis&gt;</code> in
place of the docstring.</li>
</ul>
<h2>7.1.0 (16 Sep 2024)</h2>
<ul>
<li>
<p>Introduce a <code>pytest</code> extra, such that you can install
Sybil in a way that ensures
compatible versions of Sybil and pytest are used.</p>
</li>
<li>
<p>Fix a :class:<code>DeprecationWarning</code> on Python 3.13.</p>
</li>
</ul>
<p>Thanks to Adam Dangoor for this fix.</p>
<h2>7.0.0 (12 Sep 2024)</h2>
<ul>
<li>
<p>Drop Python 3.7 support.</p>
</li>
<li>
<p>Drop support for pytest versions less than 8.</p>
</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/simplistix/sybil/commit/8d58cfe196a9f8136f8eea453805e6e3c9e6b263"><code>8d58cfe</code></a>
Prepare for 9.0.0 release</li>
<li><a
href="https://github.com/simplistix/sybil/commit/e6314b1f71bd9f7e3aa0a75dd9513cafd1734414"><code>e6314b1</code></a>
Fix capitalization of &quot;Myst&quot; -&gt; &quot;MyST&quot;</li>
<li><a
href="https://github.com/simplistix/sybil/commit/17ee34efa845eaa5f5cc8d427379e89548b729c5"><code>17ee34e</code></a>
Add API documentation for LexingException</li>
<li><a
href="https://github.com/simplistix/sybil/commit/24ed7d29edb8d95271ec2559735f0082f2dfd494"><code>24ed7d2</code></a>
Document the relationship with Lexers in the Parser concept</li>
<li><a
href="https://github.com/simplistix/sybil/commit/5599e0769193394a493ec9fc8403763579db25cf"><code>5599e07</code></a>
Add links back to concepts from the API sections</li>
<li><a
href="https://github.com/simplistix/sybil/commit/8f0bbca593750565e11d0d4107793ff192c852a8"><code>8f0bbca</code></a>
Add start location to LexingException</li>
<li><a
href="https://github.com/simplistix/sybil/commit/1b3aad8e9f1abc92325016c4c3d7b3ee4658c27f"><code>1b3aad8</code></a>
Retire Document.find_region_sources()</li>
<li><a
href="https://github.com/simplistix/sybil/commit/86b69472b6b68352234bae888a150073502ed479"><code>86b6947</code></a>
Better error message when end pattern fails to match</li>
<li><a
href="https://github.com/simplistix/sybil/commit/c4897579bd90d451e32d38a8309b219659accb8c"><code>c489757</code></a>
Prepare for 8.0.1 release</li>
<li><a
href="https://github.com/simplistix/sybil/commit/e23e4f707fa6e4db63e8b1276697551823e7026f"><code>e23e4f7</code></a>
Remove unused constant</li>
<li>Additional commits viewable in <a
href="https://github.com/simplistix/sybil/compare/6.1.1...9.0.0">compare
view</a></li>
</ul>
</details>
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</details>

Author: llucax

pyproject.toml

@@ -64,7 +64,7 @@ model = []
 extra-lint-examples = [
   "pylint >= 2.17.3, < 4",
   "pytest >= 7.3.0, < 9",
-  "sybil >= 6.1.1, < 9",
+  "sybil >= 6.1.1, < 10",
 ]
 dev-flake8 = [
   "flake8 == 7.1.1",
@@ -107,7 +107,7 @@ dev-pytest = [
   "pylint == 3.3.1",       # We need this to check for the examples
   "cookiecutter == 2.6.0", # For checking the cookiecutter scripts
   "jinja2 == 3.1.4",       # For checking the cookiecutter scripts
-  "sybil >= 6.1.1, < 9",   # Should be consistent with the extra-lint-examples dependency
+  "sybil >= 6.1.1, < 10",   # Should be consistent with the extra-lint-examples dependency
 ]
 dev = [
   "frequenz-repo-config[dev-mkdocs,dev-flake8,dev-formatting,dev-mkdocs,dev-mypy,dev-noxfile,dev-pylint,dev-pytest]",