Update actions/upload-artifact digest to 4cec3d8

Author: renovate[bot]

merge-junit-reports/action.yml

@@ -41,7 +41,7 @@ runs:
       continue-on-error: true
 
     - name: Merge JUnit report artifacts
-      uses: actions/upload-artifact/merge@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4
+      uses: actions/upload-artifact/merge@4cec3d8aa04e39d1a68397de0c4cd6fb9dce8ec1 # v4
       with:
         name: ${{ inputs.artifact-name }}
         pattern: ${{ inputs.split-artifact-pattern }}