[3.12] GH-136155: Use sphinxext-opengraph
v0.12.0 (GH-137393)
#138741
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(cherry picked from commit 39bd7c3)
This was partially backported in #136406, but we also need the conditional to ensure there's only self-closing HTML tags.
Re: #136406 (comment)
📚 Documentation preview 📚: https://cpython-previews--138741.org.readthedocs.build/