Update flake8-rst-docstrings requirement from <=0.3.1 to <=0.4.0 in /src/bindings/python (#32308)

Updates the requirements on
[flake8-rst-docstrings](https://github.com/peterjc/flake8-rst-docstrings)
to permit the latest version.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/peterjc/flake8-rst-docstrings/commit/84eb0b3f5257b830c0feb4cd81d973ba6e38e2b5"><code>84eb0b3</code></a>
Release v0.4.0 today</li>
<li><a
href="https://github.com/peterjc/flake8-rst-docstrings/commit/12360129e955a27f5b0ab96bcaa79159b30c36ff"><code>1236012</code></a>
Fix allow-prereleases setting</li>
<li><a
href="https://github.com/peterjc/flake8-rst-docstrings/commit/725d9737e734e83ffee6892a4baaaf8b92964e5c"><code>725d973</code></a>
allow-prereleases: true to use Python 3.14 rc</li>
<li><a
href="https://github.com/peterjc/flake8-rst-docstrings/commit/3c472b4ee94e5dec39b7ddf65eabc7ccd58d6521"><code>3c472b4</code></a>
Update checkout &amp; setup-python actions</li>
<li><a
href="https://github.com/peterjc/flake8-rst-docstrings/commit/9a31fb67b5fa17c1945df52d5bcfde0e37068e79"><code>9a31fb6</code></a>
docutils v0.22 fixed double RST212</li>
<li><a
href="https://github.com/peterjc/flake8-rst-docstrings/commit/8cf83d47b93dcead0bd882f2c7e131715416229f"><code>8cf83d4</code></a>
RST401 now RST309 (downgraded in docutils v0.22)</li>
<li><a
href="https://github.com/peterjc/flake8-rst-docstrings/commit/881077fc394d4881be2795f3e9517929e661d442"><code>881077f</code></a>
Define RST308</li>
<li><a
href="https://github.com/peterjc/flake8-rst-docstrings/commit/60bb674a06e24080fdb4402466e2262486a1fc62"><code>60bb674</code></a>
Old example downgraded to INFO in docutils 0.22</li>
<li><a
href="https://github.com/peterjc/flake8-rst-docstrings/commit/bb2f3defccbbf6c2165df90dfa6978b0d1e0629d"><code>bb2f3de</code></a>
Update tests with docutils v0.22.2</li>
<li><a
href="https://github.com/peterjc/flake8-rst-docstrings/commit/c399b0e5c50afb8981813f6fc9efc47bfad22e6a"><code>c399b0e</code></a>
Version bump to require Python 3.9</li>
<li>Additional commits viewable in <a
href="https://github.com/peterjc/flake8-rst-docstrings/compare/v0.0.1...v0.4.0">compare
view</a></li>
</ul>
</details>
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src/bindings/python/requirements_test.txt

@@ -16,7 +16,7 @@ flake8-expression-complexity<=0.0.11
 flake8-pep585<=0.1.7
 flake8-print<=5.0.0
 flake8-pytest-style<=2.1.0
-flake8-rst-docstrings<=0.3.1
+flake8-rst-docstrings<=0.4.0
 pygments
 flake8-string-format<=0.3.0
 flake8-variables-names<=0.0.6