add workaround for cache sometimes not being restored correctly on macos #3221
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Workaround for issue consistently seen in CI where on macos, pip cache is restored with no package data, which results in "pytest" package not being available. The workaround is to not skip the dependency installation step on cache hit. This approach ensures that, while the step completes swiftly with a valid cache, it will also properly download and install any missing packages, albeit more slowly.
cc @ekaf