Backport PR #24397 on branch v3.6.x (Simplify appveyor to only use conda) - #24616

Backport PR #24397 on branch v3.6.x (Simplify appveyor to only use conda)#24616

oscargus merged 1 commit into

matplotlib:v3.6.xmatplotlib/matplotlib:v3.6.xfrom

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