add dependency-versions highest to try to make psalm install work

Author: sirbrillig

.github/workflows/csqa.yml

@@ -100,6 +100,7 @@ jobs:
       - name: Install Composer dependencies
         uses: "ramsey/composer-install@v3"
         with:
+          dependency-versions: "highest"
           # Bust the cache at least once a month - output format: YYYY-MM.
           custom-cache-suffix: $(date -u "+%Y-%m")