Update RELEASE_NOTES.md for 1.5.13 release#340

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Arkatufus merged 1 commit intoakkadotnet:devfrom Arkatufus:Update-RELEASE_NOTES-for-1.5.13

Oct 4, 2023

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Commits on Oct 4, 2023

Update RELEASE_NOTES.md for 1.5.13 release
Arkatufus
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