Lint

Bump requests-mock-flask from 2026.2.16 to 2026.4.2 #7646

Job	Run time
build (3.13, windows-latest, pre-push)	4m 24s
build (3.13, ubuntu-latest, manual)	54s
build (3.13, ubuntu-latest, pre-push)	3m 34s
build (3.13, windows-latest, manual)	1m 43s
build (3.13, windows-latest, pre-commit)	2m 0s
build (3.13, ubuntu-latest, pre-commit)	58s
completion-lint	3s
	13m 36s

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