Update RELEASE_NOTES.md (#6741)

Added release notes for 1.5.7-beta1, so we can do a pre-release of `Akka.Delivery`
akkadotnet · May 8, 2023 · f7a5977 · f7a5977
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+#### 1.5.7-beta1 May 9th 2023 ####
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+*Placeholder for nightlies*
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 #### 1.5.6 May 8th 2023 ####
 
 Version 1.5.6 is a patch with a few minor bug fix