🔨 Separate bugfix-2.1.x CI Tests

.github/workflows/test-builds.yml

 on:
   pull_request:
     branches:
-    - bugfix-2.0.x
     - bugfix-2.1.x
     paths-ignore:
     - config/**
     - '**/*.md'
   push:
     branches:
-    - bugfix-2.0.x
     - bugfix-2.1.x
     paths-ignore:
     - config/**