[TASK] add composer update and caching to lint job

Resolves: #1139

.github/workflows/ci.yml

@@ -25,6 +25,14 @@ jobs:
           ini-file: development
           coverage: none
           tools: composer:v2
+      - name: "Cache dependencies installed with composer"
+        uses: actions/cache@v4
+        with:
+          key: "php${{ matrix.php-version }}-composer-${{ hashFiles('**/composer.json') }}"
+          path: ~/.cache/composer
+          restore-keys: "php${{ matrix.php-version }}-composer-\n"
+      - name: "Install Composer dependencies"
+        run: "composer update --no-progress"
       - name: "Show the Composer configuration"
         run: "composer config --global --list"
       - name: "Run PHP lint"