chore(deps): bump fonttools from 4.42.1 to 4.43.0 (#762)

Bumps [fonttools](https://github.com/fonttools/fonttools) from 4.42.1 to
4.43.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/fonttools/fonttools/releases">fonttools's
releases</a>.</em></p>
<blockquote>
<h2>4.43.0</h2>
<ul>
<li>[subset] Set up lxml <code>XMLParser(resolve_entities=False)</code>
when parsing OT-SVG documents to prevent XML External Entity (XXE)
attacks (9f61271dc): <a
href="https://codeql.github.com/codeql-query-help/python/py-xxe/">https://codeql.github.com/codeql-query-help/python/py-xxe/</a></li>
<li>[varLib.iup] Added workaround for a Cython bug in
<code>iup_delta_optimize</code> that was leading to IUP tolerance being
incorrectly initialised, resulting in sub-optimal deltas (60126435d, <a
href="https://redirect.github.com/cython/cython/issues/5732">cython/cython#5732</a>).</li>
<li>[varLib] Added new command-line entry point <code>fonttools
varLib.avar</code> to add an <code>avar</code> table to an existing VF
from axes mappings in a .designspace file (0a3360e52).</li>
<li>[instancer] Fixed bug whereby no longer used variation regions were
not correctly pruned after VarData optimization (<a
href="https://redirect.github.com/fonttools/fonttools/issues/3268">#3268</a>).</li>
<li>Added support for Python 3.12 (<a
href="https://redirect.github.com/fonttools/fonttools/issues/3283">#3283</a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/fonttools/fonttools/blob/main/NEWS.rst">fonttools's
changelog</a>.</em></p>
<blockquote>
<h2>4.43.0 (released 2023-09-29)</h2>
<ul>
<li>[subset] Set up lxml <code>XMLParser(resolve_entities=False)</code>
when parsing OT-SVG documents
to prevent XML External Entity (XXE) attacks (9f61271dc):
<a
href="https://codeql.github.com/codeql-query-help/python/py-xxe/">https://codeql.github.com/codeql-query-help/python/py-xxe/</a></li>
<li>[varLib.iup] Added workaround for a Cython bug in
<code>iup_delta_optimize</code> that was
leading to IUP tolerance being incorrectly initialised, resulting in
sub-optimal deltas
(60126435d, <a
href="https://redirect.github.com/cython/cython/issues/5732">cython/cython#5732</a>).</li>
<li>[varLib] Added new command-line entry point <code>fonttools
varLib.avar</code> to add an
<code>avar</code> table to an existing VF from axes mappings in a
.designspace file (0a3360e52).</li>
<li>[instancer] Fixed bug whereby no longer used variation regions were
not correctly pruned
after VarData optimization (<a
href="https://redirect.github.com/fonttools/fonttools/issues/3268">#3268</a>).</li>
<li>Added support for Python 3.12 (<a
href="https://redirect.github.com/fonttools/fonttools/issues/3283">#3283</a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/fonttools/fonttools/commit/145460e77f772767608e677737f2d00147152620"><code>145460e</code></a>
Release 4.43.0</li>
<li><a
href="https://github.com/fonttools/fonttools/commit/64f3fd83d901f2da882cca5efc38ebdfd2718ab7"><code>64f3fd8</code></a>
Update changelog [skip ci]</li>
<li><a
href="https://github.com/fonttools/fonttools/commit/7aea49e88cf997b3e0bdfd7f6330a16578c9ce5a"><code>7aea49e</code></a>
Merge pull request <a
href="https://redirect.github.com/fonttools/fonttools/issues/3283">#3283</a>
from hugovk/main</li>
<li><a
href="https://github.com/fonttools/fonttools/commit/4470c4401d628f273d79bf4bd0df42f1217fcc53"><code>4470c44</code></a>
Bump requirements.txt to support Python 3.12</li>
<li><a
href="https://github.com/fonttools/fonttools/commit/0c87cbad6e21c0f2511cdfc70ad7e1a572e84017"><code>0c87cba</code></a>
Bump scipy for Python 3.12 support</li>
<li><a
href="https://github.com/fonttools/fonttools/commit/eda6fa5cfbdfaf1d54cf391ed9c86b72288882a2"><code>eda6fa5</code></a>
Add support for Python 3.12</li>
<li><a
href="https://github.com/fonttools/fonttools/commit/0e033b0e5cd771f520bbf7346dedb7751677bd24"><code>0e033b0</code></a>
Bump reportlab from 3.6.12 to 3.6.13 in /Doc</li>
<li><a
href="https://github.com/fonttools/fonttools/commit/60126435dff31b489a9ea1a8dcc260101e5b1c20"><code>6012643</code></a>
[iup] Work around cython bug</li>
<li><a
href="https://github.com/fonttools/fonttools/commit/b14268a23c5a0dd644d2479064e4018a6b084b23"><code>b14268a</code></a>
[iup] Remove copy/pasta</li>
<li><a
href="https://github.com/fonttools/fonttools/commit/0a3360e52727cdefce2e9b28286b074faf99033c"><code>0a3360e</code></a>
[varLib.avar] New module to compile avar from .designspace file</li>
<li>Additional commits viewable in <a
href="https://github.com/fonttools/fonttools/compare/4.42.1...4.43.0">compare
view</a></li>
</ul>
</details>
<br />


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requirements.txt

@@ -12,7 +12,7 @@ Cython==3.0.2
 ephem==4.1.4
 filelock==3.12.2
 Flask==2.2.5
-fonttools==4.42.1
+fonttools==4.43.0
 fsspec==2023.6.0
 gunicorn==22.0.0
 holidays==0.31