Merge pull request #651 from kenjis/fix-composer-unused

chore: fix composer-unused version to aviod setup error

Author: kenjis

.github/workflows/unused.yml

@@ -30,7 +30,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: '8.0'
-          tools: composer, composer-unused
+          tools: composer, composer-unused:0.8.5
           extensions: intl, json, mbstring, xml
           coverage: none
         env: