chore(deps): bump babel from 2.8.0 to 2.9.0

[dependabot-preview]

Bumps babel from 2.8.0 to 2.9.0.

Release notes

Sourced from babel's releases.

Version 2.8.1

This patch version only differs from 2.8.0 in that it backports in #752.

Changelog

Sourced from babel's changelog.

Version 2.9.0

Upcoming version support changes

* This version, Babel 2.9, is the last version of Babel to support Python 2.7, Python 3.4, and Python 3.5.
Improvements

* CLDR: Use CLDR 37 – Aarni Koskela ([#734](https://github.com/python-babel/babel/issues/734))
* Dates: Handle ZoneInfo objects in get_timezone_location, get_timezone_name - Alessio Bogon ([#741](https://github.com/python-babel/babel/issues/741))
* Numbers: Add group_separator feature in number formatting - Abdullah Javed Nesar ([#726](https://github.com/python-babel/babel/issues/726))
Bugfixes

* Dates: Correct default Format().timedelta format to 'long' to mute deprecation warnings – Aarni Koskela
* Import: Simplify iteration code in "import_cldr.py" – Felix Schwarz
* Import: Stop using deprecated ElementTree methods "getchildren()" and "getiterator()" – Felix Schwarz
* Messages: Fix unicode printing error on Python 2 without TTY. – Niklas Hambüchen
* Messages: Introduce invariant that _invalid_pofile() takes unicode line. – Niklas Hambüchen
* Tests: fix tests when using Python 3.9 – Felix Schwarz
* Tests: Remove deprecated 'sudo: false' from Travis configuration – Jon Dufresne
* Tests: Support Py.test 6.x – Aarni Koskela
* Utilities: LazyProxy: Handle AttributeError in specified func – Nikiforov Konstantin ([#724](https://github.com/python-babel/babel/issues/724))
* Utilities: Replace usage of parser.suite with ast.parse – Miro Hrončok

Documentation
</code></pre>
<ul>
<li>Update parse_number comments – Brad Martin (<a href="https://github-redirect.dependabot.com/python-babel/babel/issues/708">#708</a>)</li>
<li>Add <strong>iter</strong> to Catalog documentation – <a href="https://github.com/CyanNani123">@CyanNani123</a></li>
</ul>
<h2>Version 2.8.1</h2>
<p>This is solely a patch release to make running tests on Py.test 6+ possible.</p>
<p>Bugfixes</p>
<pre><code>
* Support Py.test 6 - Aarni Koskela ([#747](https://github.com/python-babel/babel/issues/747), [#750](https://github.com/python-babel/babel/issues/750), [#752](https://github.com/python-babel/babel/issues/752))
&lt;/code&gt;&lt;/pre&gt;
&lt;/blockquote&gt;
&lt;/details&gt;
&lt;details&gt;
&lt;summary&gt;Commits&lt;/summary&gt;

&lt;ul&gt;
&lt;li&gt;See full diff in &lt;a href=&quot;https://github.com/python-babel/babel/commits&quot;&gt;compare view&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
&lt;/details&gt;

&lt;br /&gt;
</code></pre>


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[coveralls]

Coverage remained the same at 100.0% when pulling 07bcc3e on dependabot/pip/babel-2.9.0 into 4845fb6 on master.