Merge dev/pin-setup-repo-composer-version into trunk

Author: shendy-a8c

.github/actions/setup-repo/action.yml

@@ -25,5 +25,5 @@ runs:
       uses: shivammathur/setup-php@v2
       with:
         php-version: ${{ inputs.php-version }}
-        tools: composer
+        tools: composer:2.5.0
         coverage: none

.github/workflows/php-compatibility.yml

@@ -13,6 +13,6 @@ jobs:
       - uses: shivammathur/setup-php@v2
         with:
           php-version: '7.4'
-          tools:       composer
+          tools:       composer:2.5.0
           coverage:    none
       - run: bash bin/phpcs-compat.sh 

changelog/fix-php-compatibility-workflow

@@ -0,0 +1,5 @@
+Significance: patch
+Type: dev
+Comment: Fix the PHP compatibility workflow temporarily by pinning composer to 2.5.0
+
+