Do not test with --prefer-lowest

Author: sebastianbergmann

.github/workflows/ci.yml

@@ -38,8 +38,8 @@ jobs:
         uses: "actions/cache@v2"
         with:
           path: "~/.composer/cache"
-          key: "php7.3-composer-highest-${{ hashFiles('**/composer.json') }}"
-          restore-keys: "php7.3-composer-highest-"
+          key: "php7.3-composer-${{ hashFiles('**/composer.json') }}"
+          restore-keys: "php7.3-composer-"
 
       - name: "Set COMPOSER_ROOT_VERSION environment variable"
         uses: "docker://ergebnis/composer-root-version-action:0.1.3"
@@ -68,18 +68,9 @@ jobs:
           - "xdebug"
           - "xdebug3"
 
-        dependencies:
-          - "lowest"
-          - "highest"
-
         exclude:
           - php-version: "8.0"
             coverage-driver: "xdebug"
-            dependencies: "lowest"
-
-          - php-version: "8.0"
-            coverage-driver: "xdebug"
-            dependencies: "highest"
 
     steps:
       - name: "Checkout"
@@ -101,12 +92,7 @@ jobs:
       - name: "Set COMPOSER_ROOT_VERSION environment variable"
         uses: "docker://ergebnis/composer-root-version-action:0.1.3"
 
-      - name: "Install lowest dependencies with composer"
-        if: "matrix.dependencies == 'lowest'"
-        run: "./tools/composer update --no-ansi --no-interaction --no-progress --prefer-lowest"
-
-      - name: "Install highest dependencies with composer"
-        if: "matrix.dependencies == 'highest'"
+      - name: "Install dependencies with composer"
         run: "./tools/composer update --no-ansi --no-interaction --no-progress"
 
       - name: "Run tests with phpunit/phpunit"