Upgrade Bazel before trying to build with it.
Upgrade Bazel before trying to build with it.

Change-Id: I412f23a7e4e933642d6fecdededca4aea0190c37
Reviewed-on: https://code-review.googlesource.com/c/re2/+/44214
Reviewed-by: Paul Wankadia <62d4e38bb1380f055ec4b899baa75e52af09c5f7@google.com>

google/re2,google/re2,google/re2,google/re2,google/re2