Update CI workflow to use Ubuntu 22.04 and new PHP versions

Updated PHP versions and changed the runner to Ubuntu 22.04.

Author: dktapps

.github/workflows/ci.yml

@@ -7,16 +7,17 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     name: Tests (PHP ${{ matrix.php }}, Valgrind ${{ matrix.valgrind }}, Debug=${{ matrix.debug }}, ZTS=${{ matrix.zts }})
     strategy:
       fail-fast: false
       matrix:
         php:
-          - 8.1.26
-          - 8.2.13
-          - 8.3.0
+          - 8.1.33
+          - 8.2.29
+          - 8.3.25
+          - 8.4.12
         valgrind: [0, 1]
         debug: [enable, disable]
         zts: [enable, disable]