changelog: use anonymous hyperlinks

Ref: https://docutils.sourceforge.io/docs/ref/rst/restructuredtext.html#anonymous-hyperlinks
Ref: sphinx-doc/sphinx#3921
Ref: twisted/towncrier#177

Author: blueyed

changelog/4351.improvement.rst

@@ -0,0 +1 @@
+pytest's own tests now work with plugins like pytest-repeat being installed (they are not used for inner tests anymore).

changelog/_template.rst

@@ -14,7 +14,7 @@
 {% if definitions[category]['showcontent'] %}
 {% for text, values in sections[section][category]|dictsort(by='value') %}
 {% set issue_joiner = joiner(', ') %}
-- {% for value in values|sort %}{{ issue_joiner() }}`{{ value }} <https://github.com/pytest-dev/pytest/issues/{{ value[1:] }}>`_{% endfor %}: {{ text }}
+- {% for value in values|sort %}{{ issue_joiner() }}`{{ value }} <https://github.com/pytest-dev/pytest/issues/{{ value[1:] }}>`__{% endfor %}: {{ text }}
 
 
 {% endfor %}