Add PHP 8.5 to CI test matrix

Include PHP 8.5 in the test matrix to ensure compatibility with the latest PHP version.
Updated both build and smoke-test-phar jobs.

Author: claude

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php-versions: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
+        php-versions: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5' ]
         coverage-driver: [ 'pcov' ]
 
     steps:
@@ -97,7 +97,7 @@ jobs:
     runs-on: "ubuntu-22.04"
     strategy:
       matrix:
-        php-versions: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4' ]
+        php-versions: [ '7.4', '8.0', '8.1', '8.2', '8.3', '8.4', '8.5' ]
     steps:
       - name: Install PHP
         uses: shivammathur/setup-php@v2