Fix order of steps

Author: dmolineus

.github/workflows/diagnostics.yml

@@ -40,9 +40,6 @@ jobs:
           path: ~/.cache/composer
           key: ${{ runner.os }}-build-${{ env.cache-name }}
 
-      - name: Install composer dependencies
-        run: composer install
-
       - name: Cache vendor directory
         uses: actions/cache@v1
         env:
@@ -53,9 +50,6 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-build-${{ env.cache-name }}-
 
-      - name: Install phpcq toolchain
-        run: ./vendor/bin/phpcq ${{ matrix.phpcq_install }} -v
-
       - name: Cache phpcq directory
         uses: actions/cache@v1
         env:
@@ -66,6 +60,12 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-build-${{ env.cache-name }}-
 
+      - name: Install composer dependencies
+        run: composer install
+
+      - name: Install phpcq toolchain
+        run: ./vendor/bin/phpcq ${{ matrix.phpcq_install }} -v
+
       - name: Run tests
         run: ./vendor/bin/phpcq run -v ${{ matrix.output }}