ci: temporarily disable rules_angular updates on patch branches

Temporarily disable updates of rules_angular on non-main branches to
avoid breaking changes from APF (Angular Package Format). This is necessary
until the patch branch is on version 21.0.x.

See: devversion/rules_angular#63

Author: alan-agius4

renovate-presets/default.json5

@@ -54,6 +54,15 @@
       matchManagers: ['bazel', 'bazel-module', 'bazelisk'],
     },
 
+    // TODO(alanagius): delete the below rule once RC branch is `21.0.x`
+    // Temporary disable updates of `rules_angular` on non main branches due to the APF breaking change
+    // See: https://github.com/devversion/rules_angular/pull/63
+    {
+      enabled: false,
+      matchBaseBranches: ['!main'],
+      matchDepNames: ['rules_angular'],
+    },
+
     // Rule to disable NPM updates on branches other than 'main'.
     // But allow updating engines and packageManagers.
     {