This tells the git-codereview utility to target the right upstream branch when submitting changes. Change-Id: I837d2e8fb73afd11a136d552a6aad0572ec480b7
Enables usage of git-codereview in this repo, which may be useful to non-IntelliJ users. See https://pkg.go.dev/golang.org/x/review/git-codereview#hdr-Configuration Change-Id: If9ec6eae678c54bad86b126f9b9284b1a9c7ddd9