Update build-config for 3.x builds

Author: usox

.github/workflows/php.yml

@@ -2,9 +2,9 @@ name: tests
 
 on:
   push:
-    branches: [ master ]
+    branches: [ 3.x ]
   pull_request:
-    branches: [ master ]
+    branches: [ 3.x ]
 
 jobs:
   build:
@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ['ubuntu-latest']
-        php-versions: [7.4, 8.0, 8.1, 8.2]
+        php-versions: [7.4, 8.0, 8.1, 8.2, 8.3, 8.4]
     steps:
       - uses: actions/checkout@v2