Update Github workflows to use ubuntu-latest and include php 8.2

Author: chrisryan

.github/workflows/php.yml

@@ -8,10 +8,10 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-versions: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
+        php-versions: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1', '8.2']
     steps:
     - name: Checkout
       uses: actions/checkout@v2