Update HTML test files that render differently in newer docutils

tests/fixtures/test_rst_bibtex.html

@@ -1,2 +1,2 @@
 <pre><code><span class="nc">@article</span><span class="p">{</span><span class="nl">the_impact_of_pygments_docutils_config_and_html5</span><span class="p">,</span><span class="w">
-  </span><span class="na">year</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><s>{2022}</s><span class="p">,</span></code></pre>
+  </span><span class="na">year</span><span class="w"> </span><span class="p">=</span><span class="w"> </span><span class="s">{2022}</span><span class="p">,</span></code></pre>

tests/fixtures/test_rst_contents.html

@@ -1,5 +1,5 @@
 <nav class="contents" id="contents">
-<p class="topic-title">Contents</p>
+<p class="topic-title"><a href="#top" rel="nofollow">Contents</a></p>
 <ul class="simple">
 <li><p><a href="#features" id="toc-entry-1" rel="nofollow">Features</a></p></li>
 <li><p><a href="#installation" id="toc-entry-2" rel="nofollow">Installation</a></p></li>

tests/fixtures/test_rst_linkify.html

@@ -1,5 +1,9 @@
-<a href="https://travis-ci.org/tulsawebdevs/django-multi-gtfs" rel="nofollow"><img alt="https://travis-ci.org/tulsawebdevs/django-multi-gtfs.svg?branch=master" src="https://travis-ci.org/tulsawebdevs/django-multi-gtfs.svg?branch=master"></a>
-<a href="https://coveralls.io/github/tulsawebdevs/django-multi-gtfs" rel="nofollow"><img alt="https://coveralls.io/repos/github/tulsawebdevs/django-multi-gtfs/badge.svg?branch=django19" src="https://coveralls.io/repos/github/tulsawebdevs/django-multi-gtfs/badge.svg?branch=django19"></a>
+<a href="https://travis-ci.org/tulsawebdevs/django-multi-gtfs" rel="nofollow">
+<img alt="https://travis-ci.org/tulsawebdevs/django-multi-gtfs.svg?branch=master" src="https://travis-ci.org/tulsawebdevs/django-multi-gtfs.svg?branch=master">
+</a>
+<a href="https://coveralls.io/github/tulsawebdevs/django-multi-gtfs" rel="nofollow">
+<img alt="https://coveralls.io/repos/github/tulsawebdevs/django-multi-gtfs/badge.svg?branch=django19" src="https://coveralls.io/repos/github/tulsawebdevs/django-multi-gtfs/badge.svg?branch=django19">
+</a>
 <p><strong>multigtfs</strong> is an <a href="http://choosealicense.com/licenses/apache/" rel="nofollow">Apache 2.0</a>-licensed Django app that supports importing
 and exporting of GTFS feeds.  All features of the <a href="https://developers.google.com/transit/gtfs/reference" rel="nofollow">June 20, 2012 reference</a>
 are supported, including <a href="https://developers.google.com/transit/gtfs/changes#RevisionHistory" rel="nofollow">all changes</a> up to February 17, 2014.