all: update codereview.cfg for gopls-release-branch.0.14

For golang/go#63220

Change-Id: I066d60ab8d578e64c78fbccc3c664d54024d5c88
Reviewed-on: https://go-review.googlesource.com/c/tools/+/530977
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Robert Findley <rfindley@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
diff --git a/codereview.cfg b/codereview.cfg
index 3f8b14b..49d667a 100644
--- a/codereview.cfg
+++ b/codereview.cfg
@@ -1 +1,3 @@
 issuerepo: golang/go
+branch: gopls-release-branch.0.14
+parent-branch: master