Only build for main and 6.2

Author: shahmishal

.github/workflows/pull_request.yml

@@ -9,9 +9,9 @@ jobs:
     name: Test
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
-      linux_exclude_swift_versions: '[{"swift_version": "5.9"}, {"swift_version": "5.10"}]'
       linux_pre_build_command: apt-get update && apt-get install -y libsqlite3-dev libncurses5-dev
-      windows_exclude_swift_versions: '[{"swift_version": "5.9"}, {"swift_version": "5.10"}]'
+      linux_swift_versions: '["nightly-main", "nightly-6.2"]'
+      windows_swift_versions: '["nightly-main"]'
   soundness:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main