cmd/fix: support go versions with patch release
Support go version with patch release(e.g. 1.21.0)
and release candidates(e.g. 1.21rc1)
when parsing the go version in the fix command
by using new "go/version" package.
Fixes #62584
Change-Id: I0ec16137c7a396c68039d374c770c4021fb54b4e
GitHub-Last-Rev:
76bced5c48334c0937289bce8bcf50f82e3f0b98
GitHub-Pull-Request: golang/go#62586
Reviewed-on: https://go-review.googlesource.com/c/go/+/527342
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Russ Cox <rsc@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Alex Bozhenko <alexbozhenko@gmail.com>
Reviewed-by: Bryan Mills <bcmills@google.com>