Remove tests using PHPUnit 6.5 to avoid 'cover' annotation issues.

Author: kabalin

.github/workflows/test.yml

@@ -53,10 +53,6 @@ jobs:
             moodle-branch: 'MOODLE_39_STABLE'
           - php: '7.4'
             moodle-branch: 'MOODLE_38_STABLE'
-          - php: '7.2'
-            moodle-branch: 'MOODLE_35_STABLE'
-          - php: '7.0'
-            moodle-branch: 'MOODLE_35_STABLE'
 
     steps:
     - name: Check out repository code

.travis.yml

@@ -81,7 +81,3 @@ jobs:
       env: MOODLE_BRANCH=MOODLE_39_STABLE
     - php: 7.4
       env: MOODLE_BRANCH=MOODLE_38_STABLE
-    - php: 7.2
-      env: MOODLE_BRANCH=MOODLE_35_STABLE
-    - php: 7.0
-      env: MOODLE_BRANCH=MOODLE_35_STABLE