github actions adjustments

.github/workflows/ci.yml

@@ -3,24 +3,6 @@ name: CI
 on: [push, pull_request]
 
 jobs:
-  build-test-71:
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@v2
-
-      - uses: php-actions/composer@v6
-        with:
-          version: 1
-          php_version: "7.1"
-
-      - name: PHPUnit Tests
-        uses: php-actions/phpunit@v3
-        with:
-          version: 7
-          php_version: "7.1"
-          configuration: phpunit.xml.dist
-          bootstrap: vendor/autoload.php
   build-test-74:
     runs-on: ubuntu-latest
 
@@ -35,7 +17,7 @@ jobs:
       - name: PHPUnit Tests
         uses: php-actions/phpunit@v3
         with:
-          version: 7
+          version: composer
           php_version: "7.4"
           configuration: phpunit.xml.dist
           bootstrap: vendor/autoload.php