Remove Jinja2 dependency (#1360)

* Remove Jinja2 dependency, inherited from Sphinx + handled in external environments

* Remove mentioning of Jinja2 dependency change

* Add Jinja2<3.1 dependecy to affected tox environments

docs/changelog.rst

@@ -17,11 +17,11 @@ Dependency Changes
 
 Many documentation projects depend on ``sphinx-rtd-theme`` without specifying a version of the theme (unpinned) while also depending on unpinned versions of Sphinx. The latest version of ``sphinx-rtd-theme`` ideally always supports the latest version of Sphinx, but this is now guaranteed.
 
-This release adds upper bounds to direct dependencies ``Sphinx``, ``docutils`` and ``Jinja2``, which will safeguard from mixing with possibly incompatible future versions of Sphinx & friends.
+This release adds upper bounds to direct dependencies ``Sphinx`` and ``docutils`` which will safeguard from mixing with possibly incompatible future versions of Sphinx & docutils.
 
 * Sphinx versions supported: 1.6 to 5.2.x
-* ``Jinja<3.1`` (#1316)
 * ``Sphinx<6`` (#1332)
+* ``docutils<0.18`` (unchanged, but will be bumped in an upcoming release)
 
 
 Features
@@ -38,7 +38,8 @@ Fixes
 * Definition lists rendered wrongly in api docs (#1052)
 * Citation not styled properly (#1078)
 
-Minor changes
+
+Minor Changes
 -------------
 
 * Sphinx 5.2 added to test matrix (#1348)

setup.cfg

@@ -46,7 +46,6 @@ python_requires = >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*
 install_requires = 
 	sphinx >=1.6,<6
 	docutils <0.18
-	Jinja2 <3.1
 tests_require = 
 	pytest
 

tox.ini

@@ -41,6 +41,10 @@ deps =
     # Projects using these Sphinx versions will have to do the same
     # See: https://github.com/readthedocs/sphinx_rtd_theme/pull/1304
     sphinx{16,17,18,20,21,22,23,24,30,31,32,33,34,35,40,41,42}: docutils<0.18
+    # External environments are required to add this dependency for older versions of Sphinx
+    # because it didn't ship with this upper bound.
+    # See: https://github.com/sphinx-doc/sphinx/issues/10291
+    sphinx{16,17,18,20,21,22,23,24,30,31,32,33,34,35,40}: Jinja2<3.1
     sphinxlatest: Sphinx
     sphinxdev: https://github.com/sphinx-doc/sphinx/archive/refs/heads/master.zip
 commands =