Updated MSlice SHA and added release notes

[SilkeSchomann]

Description of work

Summary of work

Replaced MSlice SHA for Mantid with SHA of current MSlice main branch.

Added release notes for all changes since the last SHA update.

There is no associated issue.

To test:

Double-check SHA with SHA of current MSlice main branch.

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[robertapplin]

I can confirm the new SHA points to the head of the main branch in the mslice repo 👍