Bump provider to a60a35c

[srawlins]

This contains fixes for moving STRICT_RAW_TYPE to a Warning, for dart-lang/sdk#50796.

If you had to change anything in the flutter/tests repo, include a link to the migration guide as per the breaking change policy.

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I read the Tree Hygiene wiki page, which explains my responsibilities.
• I read the Flutter Style Guide recently, and have followed its advice.
• I signed the CLA.
• I listed at least one issue that this PR fixes in the description above.
• I updated/added relevant documentation (doc comments with ///).
• I added new tests to check the change I am making, or this PR is test-exempt.
• All existing and new tests are passing.

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[srawlins]

Time out. :( Should the "Re-run failed checks" button work? It does not seem to restart any checks, for me.

[jason-simmons]

The rerun button started a new run on Cirrus (see https://cirrus-ci.com/task/5900658587467776)

But it looks like that is not updating the GitHub UI.

[srawlins]

Oh I see, that's fine then as long as... it gets updated at some point 😅

[jason-simmons]

The reruns succeeded. Merged the PR.

[srawlins]

Thanks!