actions: update PHP versions

Author: dktapps

.github/workflows/main.yml

@@ -11,11 +11,11 @@ jobs:
     strategy:
       matrix:
         include:
-          - php: 7.3.25
+          - php: 7.3.28
             pthreads-version: 34d7e6b91ed92a625760fedd667e7cba2009e463
-          - php: 7.4.13
+          - php: 7.4.18
             pthreads-version: 34d7e6b91ed92a625760fedd667e7cba2009e463
-          - php: 8.0.1
+          - php: 8.0.5
             pthreads-version: bc16ee7b5a21faee9bd1743f830f7135b763fb56
 
     name: PHP ${{ matrix.php }}