Replace deprecated set-output to GITHUB_OUTPUT environment variable

More info: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

.github/workflows/test.yml

@@ -35,7 +35,7 @@ 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 dependencies
  uses: actions/cache@v3