project.config: lock down go1.21 branch for release.

Change-Id: Ie0828f4ac6290b79f1e8e6be0a3c969448932d02
Reviewed-on: https://go-review.googlesource.com/c/All-Projects/+/516177
Reviewed-by: Heschi Kreinick <heschi@google.com>

project.config

diff --git a/project.config b/project.config
index 6944254..574bfe0 100644
--- a/project.config
+++ b/project.config
@@ -81,9 +81,6 @@
 	label-Commit-Queue = +0..+2 group mdb/golang-release-eng-policy
 	label-Commit-Queue = +0..+1 group cria/project-golang-may-start-trybots
 	labelAs-Commit-Queue = +0..+2 group luci_scoped_account
-[access "refs/heads/release-branch.go1.21"]
-	label-Auto-Submit = +0..+1 group cria/project-golang-approvers
-	submit = group cria/project-golang-approvers
 [label "Code-Review"]
 	function = NoBlock
 	defaultValue = 0
@@ -111,7 +108,7 @@
 	value = +1 TryBots succeeded
 	copyCondition = changekind:NO_CODE_CHANGE
 [label "LUCI-TryBot-Result"]
-	description = "Label for reporting LUCI results (used only temporarily during LUCI development)"
+	description = Label for reporting LUCI results (used only temporarily during LUCI development)
 	function = NoBlock
 	defaultValue = 0
 	value = -1 TryBots failed