docs: Pin jinja2 to < 3.1.0

Jinja2 3.1.0 removed deprecated code that is still used by sphinx 1.8.x, and it looks like our custom sphinx extensions are not working with more recent versions of sphinx.. See: - pallets/jinja#1631 - readthedocs/readthedocs.org#9037 and - #7712 The exact error is: ``` Extension error: Could not import extension sphinx.builders.latex (exception: cannot import name 'contextfunction' from 'jinja2' (/dnsdist/pdns/dnsdistdist/.venv/lib/python3.7/site-packages/jinja2/__init__.py)) ```
PowerDNS · Mar 25, 2022 · 92ad297 · 92ad297
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diff --git a/docs/requirements.txt b/docs/requirements.txt
@@ -5,3 +5,4 @@ changelog>=0.5.6,<0.6
 sphinxcontrib-fulltoc
 guzzle_sphinx_theme
 docutils!=0.15,<0.18
+jinja2<3.1.0
diff --git a/pdns/dnsdistdist/docs/requirements.txt b/pdns/dnsdistdist/docs/requirements.txt
@@ -5,3 +5,4 @@ changelog>=0.5.6,<0.6
 sphinxcontrib-httpdomain
 sphinxcontrib-fulltoc
 docutils!=0.15,<0.18
+jinja2<3.1.0
diff --git a/pdns/recursordist/docs/requirements.txt b/pdns/recursordist/docs/requirements.txt
@@ -6,3 +6,4 @@ guzzle_sphinx_theme
 sphinxcontrib.httpdomain
 sphinxcontrib-fulltoc
 docutils!=0.15,<0.18
+jinja2<3.1.0