Added CI for Swift 6.0 and remove configs for older versions
Just want to be prepared for upcoming Swift 6 updates.
Basically copied https://github.com/yim-lee/swift-distributed-actors/tree/ci-5.10 But think on Jenkins side also should be updated...
This will require asking @yim-lee for help to se tup the job.
@swift-server-bot test this please
Seems like a real timeout perhaps
10:59:44 Test Suite 'SerializationTests' started at 2024-10-16 01:59:44.682
11:14:44 Test Case 'SerializationTests.test_deserialize_alreadyDeadActorRef_shouldDeserializeAsDeadLettBuild timed out (after 15 minutes). Marking the build as failed.
Seems we're able to move over to github actions, either way that hang seems suspicious.
@ktoso @yim-lee removed older versions also, as we don't need them anymore
@swift-server-bot test this please