Pin dependencies (stable)

This MR contains the following updates:

Package	Type	Update	Change
Django (source, changelog)	dependencies	pin	->
Sphinx (source)	dependencies	pin	->
django-environ (source, changelog)	dependencies	pin	->
myst-parser	dependencies	pin	->
sphinx-multiversion	dependencies	pin	->
sphinx-panels	dependencies	pin	->
sphinx-rtd-theme	dependencies	pin	->

📌 Important: Renovate will wait until you have merged this Pin MR before creating any upgrade MRs for the affected packages. Add the preset :preserveSemverRanges to your config if you instead don't wish to pin dependencies.

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