Bump MessagePack and MessagePack.ImmutableCollection · akkadotnet/Akka.Serialization.MessagePack@7713238

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

dotnet build: Akka.Serialization.MessagePack/Resolvers/PolymorphicFormatterResolver.cs#L20

XML comment has badly formed XML -- 'Expected an end tag for element 'summary'.'

dotnet build: Akka.Serialization.MessagePack/MsgPackSerializer.cs#L79

Converting null literal or possible null value to non-nullable type.

dotnet build: Akka.Serialization.MessagePack/MsgPackSerializer.cs#L79

Possible null reference return.

dotnet build: Akka.Serialization.MessagePack/MsgPackSerializer.cs#L87

Converting null literal or possible null value to non-nullable type.

dotnet build: Akka.Serialization.MessagePack/MsgPackSerializer.cs#L87

Possible null reference return.

dotnet build: Akka.Serialization.MessagePack/Resolvers/SurrogatedFormatterResolver.cs#L32

Dereference of a possibly null reference.

dotnet build: Akka.Serialization.MessagePack/Resolvers/SerializableResolver.cs#L30

Possible null reference return.

dotnet build: Akka.Serialization.MessagePack/MsgPackSerializer.cs#L173

Possible null reference return.

dotnet build: Akka.Serialization.MessagePack/Resolvers/PolymorphicFormatterResolver.cs#L40

Possible null reference return.

dotnet build: Akka.Serialization.MessagePack/Resolvers/PolymorphicFormatterResolver.cs#L68

Converting null literal or possible null value to non-nullable type.

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