project.config: grant submit access to the 1.23 release branch

For go.dev/issue/67586.

Change-Id: If1ece98d348296cadb65dc4e38c94bba8ac1c227
Reviewed-on: https://go-review.googlesource.com/c/All-Projects/+/600136
Reviewed-by: Cherry Mui <cherryyz@google.com>

project.config

diff --git a/project.config b/project.config
index d577adc..bea5358 100644
--- a/project.config
+++ b/project.config
@@ -83,6 +83,9 @@
 	submit = group mdb/golang-release-eng-policy
 	label-Auto-Submit = +0..+1 group gobot
 	label-Auto-Submit = +0..+1 group mdb/golang-release-eng-policy
+[access "refs/heads/release-branch.go1.23"]
+	submit = group cria/project-golang-approvers
+	label-Auto-Submit = +0..+1 group cria/project-golang-approvers
 [label "Code-Review"]
 	function = NoBlock
 	defaultValue = 0