Akka.Discovery 1.4.20-beta

Maintenance Release for Akka.NET 1.4** Akka.NET v1.4.20 is a minor release that includes some bug fixes and improvements to Akka.NET. [Akka: Fixed some `internal-dispatcher` usages ](https://github.com/akkadotnet/akka.net/pull/4995) [Akka: Remove restrictions required by netstandard 1.x but available in 2.0 ](https://github.com/akkadotnet/akka.net/pull/3790) [Akka: Prevent loggers to throw `FormatException` and show a friendly message instead. ](https://github.com/akkadotnet/akka.net/pull/4998) [Akka.Persistence.Sql.Common: Some persistent actors are stuck with `RecoveryTimedOutException` after circuit breaker opens](https://github.com/akkadotnet/akka.net/issues/4265) [Akka.Persistence.Sql.Common: marking Akka.Persistence.Sql.Common as `beta` for v1.4.20](https://github.com/akkadotnet/akka.net/pull/5006) [Akka.Remote: `Akka.Remote.Serialization.PrimitiveSerializers` needs cross platform compatibility](https://github.com/akkadotnet/akka.net/issues/4986) [Akka.Streams: Fixed `QueueSource.PostStop` and added a missing test case](https://github.com/akkadotnet/akka.net/pull/4991) [Akka.Cluster.Sharding: Reduce sharding warnings when there are no buffered messages](https://github.com/akkadotnet/akka.net/pull/5003) To see the [full set of fixes in Akka.NET v1.4.20, please see the milestone on Github](https://github.com/akkadotnet/akka.net/milestone/50). | COMMITS | LOC+ | LOC- | AUTHOR | | --- | --- | --- | --- | | 4 | 677 | 316 | Gregorius Soedharmo | | 3 | 3 | 3 | dependabot[bot] | | 3 | 101 | 44 | Ismael Hamed | | 2 | 5 | 0 | Aaron Stannard | | 1 | 625 | 675 | Matthew Heaton |