Update tests.yml

Author: GrahamCampbell

.github/workflows/tests.yml

@@ -67,12 +67,10 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [7.2, 7.3, 7.4]
+        php: [7.3, 7.4]
         include:
-          - php: 7.2
-            stability: prefer-lowest
           - php: 7.3
-            stability: prefer-stable
+            stability: prefer-lowest
           - php: 7.4
             stability: prefer-stable