chore: remove deprecated set-output command (#1)

Author: lucacome

action.yml

@@ -39,7 +39,7 @@ runs:
     - name: Running Prettier
       id: prettier-run
       shell: bash
-      run: echo "::set-output name=prettier-output::$(prettier --list-different --config ${{ inputs.config_path }} --ignore-path ${{ inputs.ignore_path }} --no-error-on-unmatched-pattern ${{ inputs.file_pattern }})"
+      run: echo "prettier-output=$(prettier --list-different --config ${{ inputs.config_path }} --ignore-path ${{ inputs.ignore_path }} --no-error-on-unmatched-pattern ${{ inputs.file_pattern }})" >> $GITHUB_OUTPUT
 
     - name: Fail On Error
       id: fail-on-error