try to bring back CI testing on all php versions

Author: gggeek

.github/workflows/ci.yaml

@@ -41,17 +41,17 @@ jobs:
                     -   php: '7.3'
                         operating-system: ubuntu-22.04
                     -   php: '7.2'
-                        operating-system: ubuntu-20.04
+                        operating-system: ubuntu-22.04
                     -   php: '7.1'
-                        operating-system: ubuntu-20.04
+                        operating-system: ubuntu-22.04
                     -   php: '7.0'
-                        operating-system: ubuntu-20.04
+                        operating-system: ubuntu-22.04
                     -   php: '5.6'
-                        operating-system: ubuntu-20.04
+                        operating-system: ubuntu-22.04
                     -   php: '5.5'
                         operating-system: ubuntu-22.04
                     -   php: '5.4'
-                        operating-system: ubuntu-20.04
+                        operating-system: ubuntu-22.04
         steps:
             -    name: checkout code
                  uses: actions/checkout@v3