use sphinx 6.2.1 on devel (#320)

tests/constraints.in

@@ -1,5 +1,5 @@
 # This constraints file contains pins for the stable, tested versions of sphinx
 # and antsibull-docs that production builds rely upon.
 
-sphinx == 5.3.0
+sphinx == 6.2.1
 antsibull-docs == 2.3.1  # currently approved version

tests/requirements.txt

@@ -2,9 +2,9 @@
 # This file is autogenerated by pip-compile with Python 3.10
 # by the following command:
 #
-#    pip-compile --allow-unsafe --output-file=requirements.txt --strip-extras requirements.in
+#    pip-compile --allow-unsafe --output-file=tests/requirements.txt --strip-extras tests/requirements.in
 #
-aiofiles==23.1.0
+aiofiles==23.2.1
     # via antsibull-core
 aiohttp==3.8.5
     # via
@@ -22,11 +22,11 @@ antsibull-core==2.0.0
     # via antsibull-docs
 antsibull-docs==2.3.1
     # via
-    #   -c constraints.in
-    #   -r requirements.in
+    #   -c tests/constraints.in
+    #   -r tests/requirements-relaxed.in
 antsibull-docs-parser==1.0.0
     # via antsibull-docs
-async-timeout==4.0.2
+async-timeout==4.0.3
     # via aiohttp
 asyncio-pool==0.6.0
     # via antsibull-docs
@@ -60,7 +60,7 @@ imagesize==1.4.1
     # via sphinx
 jinja2==3.1.2
     # via
-    #   -r requirements.in
+    #   -r tests/requirements-relaxed.in
     #   antsibull-docs
     #   sphinx
 markupsafe==2.1.3
@@ -81,27 +81,25 @@ pydantic==1.10.12
     # via
     #   antsibull-core
     #   antsibull-docs
-pygments==2.15.1
+pygments==2.16.1
     # via
     #   ansible-pygments
     #   sphinx
 pyproject-hooks==1.0.0
     # via build
 pyyaml==6.0.1
     # via
-    #   -r requirements.in
+    #   -r tests/requirements-relaxed.in
     #   antsibull-core
     #   antsibull-docs
 requests==2.31.0
     # via sphinx
 resolvelib==1.0.1
-    # via
-    #   -c constraints.in
-    #   -r requirements.in
+    # via -r tests/requirements-relaxed.in
 rstcheck==5.0.0
     # via
-    #   -c constraints.in
-    #   -r requirements.in
+    #   -c tests/constraints-base.in
+    #   -r tests/requirements-relaxed.in
     #   antsibull-docs
 semantic-version==2.10.0
     # via
@@ -113,34 +111,39 @@ six==1.16.0
     # via twiggy
 snowballstemmer==2.2.0
     # via sphinx
-sphinx==5.3.0
+sphinx==6.2.1
     # via
-    #   -c constraints.in
-    #   -r requirements.in
+    #   -c tests/constraints.in
+    #   -r tests/requirements-relaxed.in
     #   antsibull-docs
     #   sphinx-ansible-theme
     #   sphinx-notfound-page
     #   sphinx-rtd-theme
+    #   sphinxcontrib-applehelp
+    #   sphinxcontrib-devhelp
+    #   sphinxcontrib-htmlhelp
     #   sphinxcontrib-jquery
+    #   sphinxcontrib-qthelp
+    #   sphinxcontrib-serializinghtml
 sphinx-ansible-theme==0.10.2
-    # via -r requirements.in
+    # via -r tests/requirements-relaxed.in
 sphinx-notfound-page==0.8.3
-    # via -r requirements.in
-sphinx-rtd-theme==1.2.2
+    # via -r tests/requirements-relaxed.in
+sphinx-rtd-theme==1.3.0
     # via sphinx-ansible-theme
-sphinxcontrib-applehelp==1.0.4
+sphinxcontrib-applehelp==1.0.7
     # via sphinx
-sphinxcontrib-devhelp==1.0.2
+sphinxcontrib-devhelp==1.0.5
     # via sphinx
-sphinxcontrib-htmlhelp==2.0.1
+sphinxcontrib-htmlhelp==2.0.4
     # via sphinx
 sphinxcontrib-jquery==4.1
     # via sphinx-rtd-theme
 sphinxcontrib-jsmath==1.0.1
     # via sphinx
-sphinxcontrib-qthelp==1.0.3
+sphinxcontrib-qthelp==1.0.6
     # via sphinx
-sphinxcontrib-serializinghtml==1.1.5
+sphinxcontrib-serializinghtml==1.1.9
     # via sphinx
 tomli==2.0.1
     # via