Hopefully workaround dependabot failure in handling this action (#1280)

Author: gionn

.github/actions/cache-downloads/action.yml

@@ -29,11 +29,17 @@ runs:
       uses: actions/cache/restore@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
       with:
         path: 'downloads/**'
-        key: >-
-          cache-downloads-v${{ inputs.cache-version }}-${{ inputs.cache-name }}-
-          mq${{ steps.activemq_peek.outputs.activemq_version }}-
-          tc${{ steps.tomcat_peek.outputs.tomcat_version }}-
-          ${{ hashFiles('.github/actions/cache-downloads/prefetch-artifacts.yml') }}
+        key: |
+          ${{
+            format(
+              'cache-downloads-v{0}-{1}-mq{2}-tc{3}-{4}',
+              inputs.cache-version,
+              inputs.cache-name,
+              steps.activemq_peek.outputs.activemq_version,
+              steps.tomcat_peek.outputs.tomcat_version,
+              hashFiles('.github/actions/cache-downloads/prefetch-artifacts.yml')
+            )
+          }}
 
     - name: Prefetch artifacts
       shell: bash