fix: Show labels in deterministic order

These labels are `set`s which have no defined order. Define *some* order, so they don't flip-flop depending on the environment.

Author: oprypin

src/mkdocstrings_handlers/python/templates/material/_base/labels.html

@@ -1,7 +1,7 @@
 {% if labels %}
   {{ log.debug("Rendering labels") }}
   <span class="doc doc-labels">
-    {% for label in labels %}
+    {% for label in labels|sort %}
       <small class="doc doc-label doc-label-{{ label }}"><code>{{ label }}</code></small>
     {% endfor %}
   </span>