project.config: lock down release-branch.go1.26

Lock down the release branch to behave like the other release
branches, as per the release process. This effectively undoes
the short-term additional permission granted to all approvers
in CL 738540.

For go.dev/issue/76474.

Change-Id: I4e4eed53421dd9f0cb0fae5c7e3b26e7eb61ce64
Reviewed-on: https://go-review.googlesource.com/c/All-Projects/+/740080
Reviewed-by: Carlos Amedee <carlos@golang.org>

project.config

diff --git a/project.config b/project.config
index 3985a12..2bfa052 100644
--- a/project.config
+++ b/project.config
@@ -170,12 +170,6 @@
 	viewAllAccounts = group luci_scoped_account
 	viewAllAccounts = group mdb/copybara-git-readers
 	viewAllAccounts = group mdb/gwsq
-[access "refs/heads/release-branch.go1.26"]
-	label-Auto-Submit = +0..+1 group cria/project-golang-approvers
-	label-Auto-Submit = +0..+1 group gobot
-	submit = group cria/project-golang-approvers
-	submit = group gobot
-	submit = group luci_scoped_account
 [notify "checkins"]
 	header = to
 	email = golang-checkins@googlegroups.com