Bump pytest-cov from 2.10.1 to 2.11.1 (aio-libs#5422)

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.10.1 to 2.11.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst">pytest-cov's changelog</a>.</em></p>
<blockquote>
<h2>2.11.1 (2021-01-20)</h2>
<ul>
<li>Fixed support for newer setuptools (v42+).
Contributed by Michał Górny in <code>[aio-libs#451](pytest-dev/pytest-cov#451) &lt;https://github.com/pytest-dev/pytest-cov/pull/451&gt;</code>_.</li>
</ul>
<h2>2.11.0 (2021-01-18)</h2>
<ul>
<li>Bumped minimum coverage requirement to 5.2.1. This prevents reporting issues.
Contributed by Mateus Berardo de Souza Terra in <code>[aio-libs#433](pytest-dev/pytest-cov#433) &lt;https://github.com/pytest-dev/pytest-cov/pull/433&gt;</code>_.</li>
<li>Improved sample projects (from the <code>examples &lt;https://github.com/pytest-dev/pytest-cov/tree/master/examples&gt;</code>_
directory) to support running <code>tox -e pyXY</code>. Now the example configures a suffixed coverage data file,
and that makes the cleanup environment unnecessary.
Contributed by Ganden Schaffner in <code>[aio-libs#435](pytest-dev/pytest-cov#435) &lt;https://github.com/pytest-dev/pytest-cov/pull/435&gt;</code>_.</li>
<li>Removed the empty <code>console_scripts</code> entrypoint that confused some Gentoo build script.
I didn't ask why it was so broken cause I didn't want to ruin my day.
Contributed by Michał Górny in <code>[aio-libs#434](pytest-dev/pytest-cov#434) &lt;https://github.com/pytest-dev/pytest-cov/pull/434&gt;</code>_.</li>
<li>Fixed the missing <code>coverage context &lt;https://coverage.readthedocs.io/en/stable/contexts.html&gt;</code>_
when using subprocesses.
Contributed by Bernát Gábor in <code>[aio-libs#443](pytest-dev/pytest-cov#443) &lt;https://github.com/pytest-dev/pytest-cov/pull/443&gt;</code>_.</li>
<li>Updated the config section in the docs.
Contributed by Pamela McA'Nulty in <code>[aio-libs#429](pytest-dev/pytest-cov#429) &lt;https://github.com/pytest-dev/pytest-cov/pull/429&gt;</code>_.</li>
<li>Migrated CI to travis-ci.com (from .org).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/5e1913e013eb06d5bd1357695349d0a75fbf0503"><code>5e1913e</code></a> Bump version: 2.11.0 → 2.11.1</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/51f1f2b353ef388a00810f28f8682f891d699332"><code>51f1f2b</code></a> Update changelog.</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/d39de1eea7a2d8451fa14cd45298caeead3bf2cc"><code>d39de1e</code></a> Fix custom commands with newer setuptools</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/b45388d0bf81465759412c6b977c6a1fc5201346"><code>b45388d</code></a> Bump version: 2.10.1 → 2.11.0</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/bd7e8506d7c0d85ac10f3569b8da3584b80bc67c"><code>bd7e850</code></a> Fix link name.</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/5f935d5dc281b470687147b28f90b09dc887efc3"><code>5f935d5</code></a> Update changelog.</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/d3c382a7e7e933e9602f5a5445d03f6dc5138da0"><code>d3c382a</code></a> Skip this on 3.8+</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/a2493d5f1825568b1f66ff033a49f28437560cad"><code>a2493d5</code></a> Skip this on 3.8+</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/25eed212085ce9a2d5383a6a4a2b360d0d514f89"><code>25eed21</code></a> Turns out there were some internal changes in the pytester plugin.</li>
<li><a href="https://github.com/pytest-dev/pytest-cov/commit/42d7705b26c3fdbd74cd81a01b8fe0f213d16095"><code>42d7705</code></a> Oops.</li>
<li>Additional commits viewable in <a href="https://github.com/pytest-dev/pytest-cov/compare/v2.10.1...v2.11.1">compare view</a></li>
</ul>
</details>
<br />


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requirements/test.txt

@@ -7,7 +7,7 @@ freezegun==1.1.0
 mypy==0.790; implementation_name=="cpython"
 mypy-extensions==0.4.3; implementation_name=="cpython"
 pytest==6.2.1
-pytest-cov==2.11.0
+pytest-cov==2.11.1
 pytest-mock==3.5.1
 re-assert==1.1.0
 setuptools-git==1.2