chore: only test against PHP 71/72/73

PHP 7.4 can just use the v6 branch.

Signed-off-by: Jack Cherng <[email protected]>

Author: jfcherng

.github/workflows/php.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        php-versions: ["7.1", "7.2", "7.3", "7.4", "8.0", "8.1"]
+        php-versions: ["7.1", "7.2", "7.3"]
 
     runs-on: ${{ matrix.os }}
     steps:
@@ -59,7 +59,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        php-versions: ["7.1", "7.2", "7.3", "7.4", "8.0", "8.1"]
+        php-versions: ["7.1", "7.2", "7.3"]
 
     runs-on: ${{ matrix.os }}
     steps: