Update workflow syntax

Author: wpscholar

.github/workflows/lint.yml

@@ -30,7 +30,7 @@ jobs:
 
       - name: Get Composer Cache Directory
         id: composer-cache
-        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
 
       - name: Cache Composer vendor directory
         uses: actions/cache@v4