Update RELEASE_NOTES for 1.5.45 release

[Arkatufus]

1.5.45 July 7th, 2025

Akka.NET v1.5.45 is a minor patch containing bug fixes for Core Akka and Akka.Cluster.Sharding plugin.

• Core: Code modernization, use deconstructor for variable swapping
• Sharding: Fix unclean ShardingConsumerControllerImpl shutdown
• Core: Convert Failure to Exception for Ask<object>
• Core: Fix Settings.InjectTopLevelFallback race condition
• Sharding: Make remembered entities honor supervision strategy decisions

Supervision Strategy For Sharding Remembered Entities

• We've added a SupervisorStrategy property to ClusterShardingSettings. You can use any type of SupervisionStrategy, but it is recommended that you inherit ShardSupervisionStrategy if you're making your own custom supervision strategy.
• Remembered shard entities will now honor SupervisionStrategy decisions and stops remembered entities if the SupervisionStrategy.Decider returned a Directive.Stop or if there is a maximum restart retry limitation.

4 contributors since release 1.5.44

COMMITS	LOC+	LOC-	AUTHOR
10	823	108	Gregorius Soedharmo
1	7	13	Simon Cropp
1	60	18	ondravondra
1	1	0	Aaron Stannard

To see the full set of changes in Akka.NET v1.5.45, click here