Explicit shell bash for cache step due to how $GITHUB_OUTPUT works fo…

…r windows runners.

.github/workflows/build.yml

@@ -21,6 +21,7 @@ jobs:
 
       - name: Get Composer Cache Directory
         id: composer-cache
+        shell: bash
         run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
 
       - name: Install Composer dependencies