Update CI to run on latest grape 2.x version

Author: padde

.github/workflows/ci.yml

@@ -91,7 +91,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: ['rubocop']
     env:
-      GRAPE_VERSION: '2.0.0'
+      GRAPE_VERSION: '2.0.2'
     strategy:
       matrix:
         ruby-version: ['3.0', '3.1', '3.2', '3.3', 'head']