changelog-webapp: Change the gcp project location in app.yaml

This CL changes the gcp project to google.com:cos-changelog

BUG=b/160901711
TEST=local

Change-Id: Ia5de61ee111078f05bc1cc65706cdfd9ace11922
diff --git a/src/cmd/changelog-webapp/app.yaml b/src/cmd/changelog-webapp/app.yaml
index a646bfa..cb2fb49 100644
--- a/src/cmd/changelog-webapp/app.yaml
+++ b/src/cmd/changelog-webapp/app.yaml
@@ -3,7 +3,7 @@
 
 env_variables:
   # Authentication variables
-  COS_CHANGELOG_PROJECT_ID: "cos-oss-interns-playground"  # Used to access project secrets from secret manager
+  COS_CHANGELOG_PROJECT_ID: "google.com:cos-changelog"  # Used to access project secrets from secret manager
   COS_CHANGELOG_OAUTH_CLIENT_ID_NAME: "cos-changelog-oauth-client-id"
   COS_CHANGELOG_CLIENT_SECRET_NAME: "cos-changelog-client-secret"
   COS_CHANGELOG_SESSION_SECRET_NAME: "cos-changelog-session-secret"