Pin dependencies

This MR contains the following updates:

Package	Update	Change
recommonmark	pin	>=0.6.0 -> ==0.7.1
sphinx (source)	pin	>=2.3.1 -> ==4.3.2
sphinx_rtd_theme	pin	>=0.4.3 -> ==1.0.0

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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docs/requirements.txt

-sphinx>=2.3.1
-sphinx_rtd_theme>=0.4.3
-recommonmark>=0.6.0
+sphinx==4.3.2
+sphinx_rtd_theme==1.0.0
+recommonmark==0.7.1
 sphinx-markdown-tables==0.0.15