Backport PR #20987 on branch v3.5.x (FIX: colorbar with boundary norm, proportional, extend) - #21002

Backport PR #20987 on branch v3.5.x (FIX: colorbar with boundary norm, proportional, extend)#21002

dstansby merged 1 commit into

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

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