cmd/{adminapp,adminredirect,googlegolangorg}: update App Engine runtime

Keep them up with the times.

For golang/go#72774.

Change-Id: Ic9e59e3fc06f70c083065a71f28f70bbe6d4c467
Reviewed-on: https://go-review.googlesource.com/c/website/+/818441
Reviewed-by: Ethan Lee <ethanalee@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>

cmd/adminapp/app.yaml

diff --git a/cmd/adminapp/app.yaml b/cmd/adminapp/app.yaml
index f1e927a..e010f56 100644
--- a/cmd/adminapp/app.yaml
+++ b/cmd/adminapp/app.yaml
@@ -1,5 +1,5 @@
 service: default
-runtime: go125
+runtime: go127
 main: ./cmd/adminapp
 
 env_variables:

cmd/adminredirect/app.yaml

diff --git a/cmd/adminredirect/app.yaml b/cmd/adminredirect/app.yaml
index 8e0900d..20fa723 100644
--- a/cmd/adminredirect/app.yaml
+++ b/cmd/adminredirect/app.yaml
@@ -1,5 +1,5 @@
 service: admin
-runtime: go125
+runtime: go127
 main: ./cmd/adminredirect
 
 env_variables:

cmd/googlegolangorg/app.yaml

diff --git a/cmd/googlegolangorg/app.yaml b/cmd/googlegolangorg/app.yaml
index 76687fb..fac7037 100644
--- a/cmd/googlegolangorg/app.yaml
+++ b/cmd/googlegolangorg/app.yaml
@@ -1,3 +1,3 @@
 service: google
-runtime: go125
+runtime: go127
 main: ./cmd/googlegolangorg