[BUGFIX:build-system] Downgrade click

Click is an implicit requirement, installed for mkdocs. After version
8.2.1 it fails to watch for changes in the input files. Temporarily pin
at version 8.2.1.

Author: gkaf89

requirements.txt

@@ -1,6 +1,9 @@
 Babel==2.17.0
 certifi==2025.10.5
-click==8.3.0
+# Pin because of bug with `--watch` option
+# - https://github.com/squidfunk/mkdocs-material/issues/8478
+# - https://github.com/mkdocs/mkdocs/issues/4032
+click==8.2.1
 confuse==2.1.0
 future==1.0.0
 gitdb==4.0.12