ci(backport): test build against matching Cryostat version (#650)

Author: andrewazores

.github/workflows/ci.yml

@@ -79,7 +79,7 @@ jobs:
     - uses: actions/checkout@v4
       with:
         repository: ${{ github.repository_owner }}/cryostat
-        ref: main
+        ref: cryostat-v4.1
         submodules: true
         fetch-depth: 0
     - uses: actions/setup-java@v3