Tests crash and unit tests hang on Swift 6.0

[rnro]

See e.g.
https://github.com/apple/swift-distributed-actors/actions/runs/11934835128/job/33264822358?pr=1178
https://github.com/apple/swift-distributed-actors/actions/runs/11934835128/job/33264815917?pr=1178

Test Case 'SerializationTests.test_serialize_Int_withData' started at 2024-11-20 14:01:22.517
Swift/UnsafeRawPointer.swift:440: Fatal error: load from misaligned raw pointer

*** Signal 4: Backtracing from 0x7fc4a8c02bb4... done ***

*** Program crashed: Illegal instruction at 0x00007fc4a8c02bb4 ***

Thread 0 "swift-distribut" crashed:

0              0x00007fc4a8c02bb4 closure #1 in closure #1 in closure #1 in _assertionFailure(_:_:file:line:flags:) + 308 in libswiftCore.so
1 [ra]         0x00007fc4a8c02962 closure #1 in closure #1 in _assertionFailure(_:_:file:line:flags:) + 257 in libswiftCore.so
2 [ra]         0x00007fc4a8c0281d closure #1 in _assertionFailure(_:_:file:line:flags:) + 380 in libswiftCore.so
3 [ra]         0x00007fc4a8d85d16 _assertionFailure(_:_:file:line:flags:) + 229 in libswiftCore.so
4 [ra]         0x00007fc4a8d85f6e _fatalErrorMessage(_:_:file:line:flags:) + 45 in libswiftCore.so
5 [ra]         0x00007fc4a8e07bd0 UnsafeRawBufferPointer.load<A>(fromByteOffset:as:) + 191 in libswiftCore.so
6 [ra]         0x00005626739d427d closure #1 in IntegerSerializer.deserialize(from:) + 92 in swift-distributed-actorsPackageTests.xctest at /__w/swift-distributed-actors/swift-distributed-actors/Sources/DistributedCluster/Serialization/Serialization+PrimitiveSerializers.swift:76:64
7 [ra] [thunk] 0x00005626739d4a28 partial apply for closure #1 in IntegerSerializer.deserialize(from:) + 23 in swift-distributed-actorsPackageTests.xctest at //<compiler-generated>
8 [ra]         0x00007fc4a95c43bf partial apply for closure #1 in Data.InlineData.withUnsafeBytes<A>(_:) + 30 in libFoundationEssentials.so
9 [ra]         0x00007fc4a963d798 Data.InlineData.withUnsafeBytes<A>(_:) + 263 in libFoundationEssentials.so
...