Bump pycparser from 2.20 to 2.21 (#118)

Bumps [pycparser](https://github.com/eliben/pycparser) from 2.20 to
2.21.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/eliben/pycparser/blob/master/CHANGES">pycparser's
changelog</a>.</em></p>
<blockquote>
<ul>
<li>
<p>Version 2.21 (2021.11.06)</p>
<ul>
<li>Much improved support for C11 (multiple PRs)</li>
<li>Support for parehthesized compount statements (<a
href="https://redirect.github.com/eliben/pycparser/issues/423">#423</a>)</li>
<li>Support for modern Python versions (3.9 and 3.10)</li>
<li>Fix support for structs with nested enums (<a
href="https://redirect.github.com/eliben/pycparser/issues/387">#387</a>)</li>
<li>Multiple small bug fixes</li>
</ul>
</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/eliben/pycparser/commit/3cf6bf5eb16f5eadd4a058e41596145c407a79ad"><code>3cf6bf5</code></a>
Update TODO to mention bdist_wheel</li>
<li><a
href="https://github.com/eliben/pycparser/commit/7593f34d742b2e3de502f28d53460190d2e42b02"><code>7593f34</code></a>
Update TODO with distribution testing instructions</li>
<li><a
href="https://github.com/eliben/pycparser/commit/b400c0041e1646ef51d0347622d340eba44f3af9"><code>b400c00</code></a>
Preparation for releasing 2.21</li>
<li><a
href="https://github.com/eliben/pycparser/commit/f19cd1412849aaf8759d8db8199ddd66ac789e87"><code>f19cd14</code></a>
Don't run cpp/gcc-needing tests on Darwin: not all Macs have the
tools</li>
<li><a
href="https://github.com/eliben/pycparser/commit/268067bb6dcdb816010ae2dbc2c5edc9e260c59d"><code>268067b</code></a>
Only run example tests on Linux, since many require cpp</li>
<li><a
href="https://github.com/eliben/pycparser/commit/43997f164eaf871f1d8b996b94a0b6bf1ae17997"><code>43997f1</code></a>
Try to make func_calls example pass on all platforms with no
arguments</li>
<li><a
href="https://github.com/eliben/pycparser/commit/7beef72dea11cf421f6ab7fce81d8592776cf79f"><code>7beef72</code></a>
Add test that runs all examples and makes sure they don't crash</li>
<li><a
href="https://github.com/eliben/pycparser/commit/615317a473f09b9b9d444313ac15e52e7763c7c1"><code>615317a</code></a>
Merge branch 'master' of github.com:eliben/pycparser</li>
<li><a
href="https://github.com/eliben/pycparser/commit/50dac813775bae329297b79a258625f74b00a7a3"><code>50dac81</code></a>
Clarify README w.r.t. C11 support in fake headers</li>
<li><a
href="https://github.com/eliben/pycparser/commit/a7b480ccbb4834e59858f5ffd04ab485da1e4b94"><code>a7b480c</code></a>
Fix typos (<a
href="https://redirect.github.com/eliben/pycparser/issues/443">#443</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/eliben/pycparser/compare/release_v2.20...release_v2.21">compare
view</a></li>
</ul>
</details>
<br />


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Pipfile

@@ -29,7 +29,7 @@ markupsafe = ">=1.1.1"
 minizinc = "==0.9.0"
 mysqlclient = "==2.0.3"
 pipenv = "*"
-pycparser = "==2.20"
+pycparser = "==2.21"
 pyjwt = "==2.8.0"
 python-dateutil = "==2.8.2"
 python-dotenv = "==1.0.0"