.github/workflows: tidy go caches before uploading

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Delete files from `$(go env GOCACHE)` and `$(go env GOMODCACHE)/cache`
that have not been modified in >= 90 minutes as these files are not
resulting in cache hits on the current branch.

These deltions have resulted in the uploaded / downloaded compressed
cache size to go down to ~1/3 of the original size in some instances
with the extracted size being ~1/4 of the original extraced size.

Updates https://github.com/tailscale/tailscale/issues/15238

Signed-off-by: Mario Minardi <mario@tailscale.com>

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