Remove mkdocs-material-extensions from requirements.txt #3666
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What type of PR is this?
/kind cleanup
What this PR does / why we need it:
The mkdocs-material-extensions package is now deprecated, and it's usage in mkdocs.yaml was removed in #3663. This fix also removes it from requirements.txt to prevent unnecessary installation.
Which issue(s) this PR fixes:
N/A
Does this PR introduce a user-facing change?:
CC: @blake