Update coursier/cache-action action to v7 (#49)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           java-version: ${{ matrix.java }}
       - name: Coursier cache
-        uses: coursier/cache-action@v6
+        uses: coursier/cache-action@v7
       - name: sbt ci ${{ github.ref }}
         run: ./sbt ci