Update RELEASE_NOTES.md for 1.5.6 release#6740

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Aaronontheweb merged 1 commit intoakkadotnet:devfrom Arkatufus:Update-RELEASE_NOTES-for-1.5.6

May 8, 2023

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Commits on May 8, 2023

Update RELEASE_NOTES.md for 1.5.6 release
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