[TASK] CI: Remove superfluous tests (#350)

.github/workflows/continuous-integration.yml

@@ -1,4 +1,4 @@
-name: Continuous Integration (CI)
+name: Continuous Integration / Deployment (CI/CD)
 
 on:
   push:
@@ -372,15 +372,12 @@ jobs:
         dependencies: ['lock']
         experimental: [false]
         include:
-          - php-version: 'latest'
-            dependencies: 'lock'
+          - php-version: '8.1'
+            dependencies: 'highest'
             experimental: true
           - php-version: 'latest'
             dependencies: 'highest'
             experimental: true
-          - php-version: 'nightly'
-            dependencies: 'lock'
-            experimental: true
           - php-version: 'nightly'
             dependencies: 'highest'
             experimental: true
@@ -417,12 +414,8 @@ jobs:
       - name: Setup authentication for Composer
         run: composer config github-oauth.github.com ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Handle lowest dependencies update
-        if: contains(matrix.dependencies, 'lowest')
-        run: echo "COMPOSER_UPDATE_FLAGS=$COMPOSER_UPDATE_FLAGS --prefer-lowest" >> $GITHUB_ENV
-
       - name: Allow alpha releases for latest-deps builds to catch problems earlier
-        if: contains(matrix.dependencies, 'highest')
+        if: ${{ matrix.dependencies == 'highest' }}
         run: composer config minimum-stability alpha
 
       - name: Set platform.php for nightly
@@ -461,15 +454,9 @@ jobs:
           - php-version: '8.1'
             dependencies: 'highest'
             experimental: true
-          - php-version: 'latest'
-            dependencies: 'lock'
-            experimental: true
           - php-version: 'latest'
             dependencies: 'highest'
             experimental: true
-          - php-version: 'nightly'
-            dependencies: 'lock'
-            experimental: true
           - php-version: 'nightly'
             dependencies: 'highest'
             experimental: true
@@ -554,7 +541,6 @@ jobs:
           path: var/log
           retention-days: 7
 
-
   coveralls-finish:
     name: Finish Coveralls
     needs: