[3.9] Fix documentation build by pinning Alabaster version to 0.7.13 (#113815)

Alabaster is Sphinx's dependency. Alabaster 0.7.14 released on 2024-01-08 dropped support for Sphinx 3.3 and earlier.

https://alabaster.readthedocs.io/en/latest/changelog.html

diff --git a/Doc/requirements.txt b/Doc/requirements.txt
index cf659a0fbac2ec781ef1e0f7783173b3cde6b7a2..d674857a353d2bd7f155ce47a5b0d418fda8594d 100644 (file)
--- a/Doc/requirements.txt
+++ b/Doc/requirements.txt
@@ -10,6 +10,8 @@ sphinx==2.4.4
 docutils==0.17.1
 # Jinja version is pinned to a version compatible with Sphinx version 2.4.4.
 jinja2==3.0.3
+# Alabaster version is pinned to a version compatible with Sphinx version 2.4.4.
+alabaster==0.7.13
 
 blurb