subpaths should be quoted to prevent nonsensical messages

[jsoref]

act/pkg/runner/action_cache.go

Line 135 in 324bab6

logger.Infof("GoGitActionCache get content %s with sha %s subpath %s at %s", cacheDir, sha, includePrefix, gitPath)

• Error is lumped together with sentence resulting in nonsensical message #2752 shows that path '' is quoted, subpaths should be quoted for the same reasons (it's confusing when they're empty, and it's confusing when they have spaces in their names)