Bump sybil from 5.0.2 to 5.0.3 (#137)

Bumps [sybil](https://github.com/simplistix/sybil) from 5.0.2 to 5.0.3.
<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>5.0.3 (14 Jul 2023)</h2>
<ul>
<li>Fix bug in traceback trimming on the latest release of pytest.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/simplistix/sybil/commit/6cbbb7940ced12e4a77943012b499a64e52d08cb"><code>6cbbb79</code></a>
Prepare for 5.0.3 release</li>
<li><a
href="https://github.com/simplistix/sybil/commit/280a005ad6d25f2ee85ed17348cd0904b872bb7c"><code>280a005</code></a>
Adjust lexing expectations after text change</li>
<li><a
href="https://github.com/simplistix/sybil/commit/d92e744af3e6bbff200ac259c7590c26d8162555"><code>d92e744</code></a>
Move doctest examples out of .py file</li>
<li><a
href="https://github.com/simplistix/sybil/commit/ed027e8c75c2c3b818ddc76249ba9d8144e1aa22"><code>ed027e8</code></a>
Add explicit tests for doctests and the end of fenced python
codeblocks</li>
<li><a
href="https://github.com/simplistix/sybil/commit/0e707b455a2aac9b749ef06dba4dd357717f3fcb"><code>0e707b4</code></a>
Note that this test needs to be at the end</li>
<li><a
href="https://github.com/simplistix/sybil/commit/df0d221c1d9da1454a5ef7fd72675d8d43b96eb0"><code>df0d221</code></a>
Deal with more pytest internals changing</li>
<li>See full diff in <a
href="https://github.com/simplistix/sybil/compare/5.0.2...5.0.3">compare
view</a></li>
</ul>
</details>
<br />

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</details>

Author: Marenz

pyproject.toml

@@ -69,7 +69,7 @@ dev-pytest = [
   "pytest-asyncio == 0.21.1",
   "pytest-mock == 3.11.1",
   # For checking docs examples
-  "sybil == 5.0.2",
+  "sybil == 5.0.3",
   "pylint == 2.17.4",
 ]
 dev = [