Update flake8-isort requirement from <5,>=4 to >=4,<7 in /requirements (#20)

Updates the requirements on
[flake8-isort](https://github.com/gforcada/flake8-isort) to permit the
latest version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/gforcada/flake8-isort/blob/master/CHANGES.rst">flake8-isort's
changelog</a>.</em></p>
<blockquote>
<h2>6.0.0 (2022-12-22)</h2>
<ul>
<li>
<p>Drop isort 4.x support.
[gforcada]</p>
</li>
<li>
<p>Add support for flake8 6.0.0.
[gforcada]</p>
</li>
<li>
<p>Add <code>--isort-no-skip-gitignore</code> option to allow
temporarily overriding the set
value of isort's <code>skip_gitignore</code> option with
<code>False</code>. This can cause
flake8-isort to run significantly faster at the cost of making
flake8-isort's
behavior differ slightly from the behavior of <code>isort
--check</code>. [gschaffner]</p>
</li>
</ul>
<h2>5.0.3 (2022-11-20)</h2>
<ul>
<li>Fix broken <code>add_options</code> method, again. [casperdcl]</li>
</ul>
<h2>5.0.2 (2022-11-19)</h2>
<ul>
<li>Fix broken <code>add_options</code> method [casperdcl]</li>
</ul>
<h2>5.0.1 (2022-11-18)</h2>
<ul>
<li>
<p>Improve the config option is added and read back. [gforcada]</p>
</li>
<li>
<p>Bump plugin version. [gforcada]</p>
</li>
</ul>
<h2>5.0.0 (2022-10-08)</h2>
<ul>
<li>
<p>Update dependencies. [gforcada]</p>
</li>
<li>
<p>Revamp GitHub actions. [gforcada]</p>
</li>
<li>
<p>Drop python 3.6, and add python 3.10. [gforcada]</p>
</li>
<li>
<p>Use linters and formatters to keep code sane and beautiful.
[gforcada]</p>
</li>
</ul>
<h2>4.2.0 (2022-08-04)</h2>
<ul>
<li>Fix compatibility with flake8 version 5. [nhymxu]</li>
</ul>
<h2>4.1.2.post0 (2022-07-25)</h2>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/gforcada/flake8-isort/commit/5d55a7e66841f60ac25395957ff3cb02f3b5ac17"><code>5d55a7e</code></a>
Preparing release 6.0.0</li>
<li><a
href="https://github.com/gforcada/flake8-isort/commit/54b2052a22c0719ea50814e5d477ec0344923612"><code>54b2052</code></a>
Merge pull request <a
href="https://redirect.github.com/gforcada/flake8-isort/issues/135">#135</a>
from gforcada/gforcada-patch-1</li>
<li><a
href="https://github.com/gforcada/flake8-isort/commit/1525065dbb2b1a58c61acc8f55eb8770c83e4912"><code>1525065</code></a>
Update CHANGES</li>
<li><a
href="https://github.com/gforcada/flake8-isort/commit/2ef02bf1bedd185f8a562abeca6058716cb2b99a"><code>2ef02bf</code></a>
chore(ci): test with flake8 6.0.0</li>
<li><a
href="https://github.com/gforcada/flake8-isort/commit/85c1018891b1bbdf47349b81a3e9fcade6b0bcd9"><code>85c1018</code></a>
Merge pull request <a
href="https://redirect.github.com/gforcada/flake8-isort/issues/130">#130</a>
from gschaffner/no-skip-gitignore</li>
<li><a
href="https://github.com/gforcada/flake8-isort/commit/65c1a594949a19e01f9e33afc3b739cb9560b8ce"><code>65c1a59</code></a>
Merge pull request <a
href="https://redirect.github.com/gforcada/flake8-isort/issues/133">#133</a>
from gforcada/drop-isort-4</li>
<li><a
href="https://github.com/gforcada/flake8-isort/commit/eb16f5dd0cea16f28a6affc7e4d2823347c801c0"><code>eb16f5d</code></a>
Update CHANGES</li>
<li><a
href="https://github.com/gforcada/flake8-isort/commit/9e37bf46ef3b6ef4038a73cf6ace2a4c5c929ca7"><code>9e37bf4</code></a>
chore(ci): bump isort version tested</li>
<li><a
href="https://github.com/gforcada/flake8-isort/commit/4d0cdb45198c81984a5b162145bce57e708ddf0a"><code>4d0cdb4</code></a>
chore: bump isort restriction</li>
<li><a
href="https://github.com/gforcada/flake8-isort/commit/41604b1d17376f6812e6ed79f7bb0ef064c5e626"><code>41604b1</code></a>
breaking: remove isort 4 code</li>
<li>Additional commits viewable in <a
href="https://github.com/gforcada/flake8-isort/compare/4.0.0...6.0.0">compare
view</a></li>
</ul>
</details>
<br />


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</details>

Author: Guts

requirements/development.txt

@@ -3,6 +3,6 @@
 
 black
 flake8-builtins>=2,<3
-flake8-isort>=4,<5
+flake8-isort>=4,<7
 flake8-qgis>=1,<2
 pre-commit>=3,<4