Backport PR #23260 on branch v3.5.x (Fix Colorbar extend patches to have correct alpha) - #23275

Backport PR #23260 on branch v3.5.x (Fix Colorbar extend patches to have correct alpha)#23275

timhoffm merged 1 commit into

matplotlib:v3.5.xmatplotlib/matplotlib:v3.5.xfrom

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