Decrease oauth2 token refresh grace period

Signed-off-by: Jessica He <jhe@redhat.com>

.changeset/wet-rats-exist.md

@@ -0,0 +1,5 @@
+---
+'@backstage/core-app-api': patch
+---
+
+Decrease OAuth2 token refresh grace period

packages/core-app-api/src/apis/implementations/auth/oauth2/OAuth2.ts

@@ -148,7 +148,7 @@ export default class OAuth2
             (session.backstageIdentity.expiresAt.getTime() - Date.now()) / 1000,
           );
         }
-        return min < 60 * 5;
+        return min < 60 * 3;
       },
     });