chore: fix github action warning

Use the same solution that was implemented for core contracts.

Resolves: #636

.github/workflows/diamond-storage-check.yml

@@ -28,7 +28,7 @@ jobs:
         working-directory: packages/contracts
         run: |
           forge tree | grep -E '^src/dollar/libraries/Lib' | cut -d' ' -f1 | xargs basename -a | cut -d'.' -f1 | xargs -I{} echo src/dollar/libraries/{}.sol:{} >> contracts.txt
-          echo "::set-output name=matrix::$(cat contracts.txt | jq -R -s -c 'split("\n")[:-1]')"
+          echo "matrix=$(cat contracts.txt | jq -R -s -c 'split("\n")[:-1]')" >> $GITHUB_OUTPUT
 
     outputs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}