[build] Added dedicated requirements and constraints files for docs dependencies.

Signed-off-by: Michael Seifert <m.seifert@digitalernachschub.de>

Author: seifertm

.github/dependabot.yml

@@ -7,6 +7,12 @@ updates:
     interval: weekly
   open-pull-requests-limit: 10
   target-branch: main
+- package-ecosystem: pip
+  directory: /dependencies/docs
+  schedule:
+    interval: weekly
+  open-pull-requests-limit: 10
+  target-branch: main
 - package-ecosystem: github-actions
   directory: /
   schedule:

dependencies/docs/constraints.txt

@@ -0,0 +1,23 @@
+alabaster==0.7.13
+Babel==2.13.1
+certifi==2023.7.22
+charset-normalizer==3.3.1
+docutils==0.18.1
+idna==3.4
+imagesize==1.4.1
+Jinja2==3.1.2
+MarkupSafe==2.1.3
+packaging==23.2
+Pygments==2.16.1
+requests==2.31.0
+snowballstemmer==2.2.0
+Sphinx==7.2.6
+sphinx-rtd-theme==1.3.0
+sphinxcontrib-applehelp==1.0.7
+sphinxcontrib-devhelp==1.0.5
+sphinxcontrib-htmlhelp==2.0.4
+sphinxcontrib-jquery==4.1
+sphinxcontrib-jsmath==1.0.1
+sphinxcontrib-qthelp==1.0.6
+sphinxcontrib-serializinghtml==1.1.9
+urllib3==2.0.7

dependencies/docs/requirements.txt

@@ -0,0 +1,2 @@
+sphinx >= 5.3
+sphinx-rtd-theme >= 1.0