Async/await tests failing

[pkrll]

Describe the bug Running swift test using this action fails with:

dyld: lazy symbol binding failed: Symbol not found: _concurrencyEnableJobDispatchIntegration
  Referenced from: /Users/runner/hostedtoolcache/swift-macOS/5.6.1/x64/usr/lib/swift/macosx/libswift_Concurrency.dylib
  Expected in: /usr/lib/swift/libswiftCore.dylib

The project is a Swift package with test cases using async/await.

Workflow configuration (please complete the following information):

• Platform (runs-on): macos-latest
• Swift version (swift-version): 5.6.1