Add payload_mut for zsliceshmmut deserialization #6031

Job	Run time
Unit tests on ubuntu-latest	20m 34s
Unit tests on windows-latest	5m 46s
Lints and doc tests on ubuntu-latest	2m 49s
Unit tests on macos-13	10m 50s
Lints and doc tests on windows-latest	9m 11s
Unit tests on macos-14	16m 42s
Lints and doc tests on macos-13	6m 37s
Lints and doc tests on macos-14	4m 6s
Memory leak checks	0s
CI status checks	1s
	1h 16m 36s

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