Update towncrier to >= 21.3.0.

Said version made a breaking change - to move the version headings into the jinja2 template so that anyone using a custom template (like us) is short of a title. This commit adds the title to our own custom template and pins the towncrier verion to >= 21.3.0 so that we don't accidently get two titles. See twisted/towncrier#147 and twisted/towncrier#340 for details.
bwoodsend · Oct 4, 2021 · 3230524 · 3230524
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diff --git a/news/_template.rst b/news/_template.rst
@@ -1,3 +1,5 @@
+{{ versiondata.version }} ({{ versiondata.date }})
+{{ top_underline * ((versiondata.version + versiondata.date)|length + 4)}}
 {% macro print_issue_numbers(issues) %}
 {% for issue in issues if issue.startswith('#') %}
 {% if loop.first %} ({% endif %}

diff --git a/tests/requirements-developer.txt b/tests/requirements-developer.txt
@@ -22,7 +22,7 @@ pycmd  # Contains 'py.cleanup' that removes all .pyc files and similar.
 wheel>0.24.0  # For creating .whl packages
 twine         # For secure upload of tar.gz to PYPI.
 
-towncrier>=19.2.0    # For creating the change-log file.
+towncrier>=21.3.0    # For creating the change-log file.
 
 zest.releaser>=6.18  # Makes releasing easier
 # Addons for zest.releaser: