[ci] expand github actions

Author: glessard

.github/workflows/pull_request.yml

@@ -9,7 +9,10 @@ jobs:
     name: Test
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
-      linux_exclude_swift_versions: '[{"swift_version": "5.8"}]'
+      linux_os_versions: '["jammy", "focal"]'
+      enable_macos_checks: false
+      macos_xcode_versions: '["16.3"]'
+
   soundness:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main