`gh-actions/cache/restore`: Add missing shell (#2429) #4462

Job	Run time
gh-actions (20.x, appauth)	39s
gh-actions (20.x, dispatch)	23s
gh-actions (20.x, github/checks)	24s
gh-actions (20.x, github/mutex)	23s
gh-actions (20.x, github/script/run)	19s
gh-actions (20.x, hashfiles)	20s
gh-actions (20.x, jq)	21s
gh-actions (20.x, retest)	28s
gh-actions (20.x, torun)	18s
	3m 35s

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