Only run insiders job against 6.1 (#1496)

6.1 is stable, don't want to run insiders against multiple versions

Author: award999

.github/workflows/nightly.yml

@@ -56,7 +56,7 @@ jobs:
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
       # Linux
-      linux_exclude_swift_versions: '[{"swift_version": "5.8"}, {"swift_version": "5.9"}, {"swift_version": "5.10"}, {"swift_version": "nightly-6.1"}, {"swift_version": "nightly-main"}]'
+      linux_exclude_swift_versions: '[{"swift_version": "5.8"}, {"swift_version": "5.9"}, {"swift_version": "5.10"}, {"swift_version": "6.0"}, {"swift_version": "nightly-6.1"}, {"swift_version": "nightly-main"}]'
       linux_env_vars: |
         NODE_VERSION=v20.18.2
         NODE_PATH=/usr/local/nvm/versions/node/v20.18.2/bin
@@ -66,7 +66,7 @@ jobs:
       linux_pre_build_command: . .github/workflows/scripts/setup-linux.sh
       linux_build_command: ./scripts/test.sh
       # Windows
-      windows_exclude_swift_versions: '[{"swift_version": "5.9"}, {"swift_version": "nightly-6.1"}, {"swift_version": "nightly"}]'
+      windows_exclude_swift_versions: '[{"swift_version": "5.9"}, {"swift_version": "6.0"}, {"swift_version": "nightly-6.1"}, {"swift_version": "nightly"}]'
       windows_env_vars: |
         CI=1
         VSCODE_VERSION=insiders