Update pull_request.yml

Author: MaxDesiatov

.github/workflows/pull_request.yml

@@ -19,6 +19,7 @@ jobs:
     uses: MaxDesiatov/github-workflows/.github/workflows/swift_package_test.yml@patch-1
     with:
       enable_linux_checks: true
+      linux_exclude_swift_versions: '[{"swift_version": "5.9"}]'
       enable_windows_checks: false
       swift_flags: --package-path AudioWorkstation/ServerHost