Adjust cache path for Scylla ccm images

It seems that the Scylla images for ccm were not cached correctly,
because in contrast to cassandra images the path to them is slightly
different. The save step outputs a warning about that but it's not
failing the step itself.

Author: Bouncheck

.github/workflows/tests@v1.yml

@@ -331,7 +331,7 @@ jobs:
         uses: actions/cache/restore@v4
         id: ccm-cache
         with:
-          path: ~/.ccm/repository
+          path: ~/.ccm/scylla-repository
           key: ccm-scylla-${{ runner.os }}-${{ steps.scylla-version.outputs.value }}
 
       - name: Download Scylla (${{ steps.scylla-version.outputs.value }}) image
@@ -346,7 +346,7 @@ jobs:
         uses: actions/cache/save@v4
         if: steps.ccm-cache.outputs.cache-hit != 'true'
         with:
-          path: ~/.ccm/repository
+          path: ~/.ccm/scylla-repository
           key: ccm-scylla-${{ runner.os }}-${{ steps.scylla-version.outputs.value }}
 
       - name: Run integration tests on Scylla (${{ steps.scylla-version.outputs.value }})