near-vm: update rkyv to 0.8 #8408

Job	Run time
Cargo Deny	31s
Cargo Audit	19s
Cargo Nextest (Linux)	1m 23s
Cargo Clippy	1m 16s
Cargo Nextest (Linux Nightly)	1s
Cargo Fmt	21s
Cargo Nextest (MacOS)	27s
Non-default Configuration Builds	33s
Themis	42s
Unused Dependencies	1s
Rust Doctests	1s
Protobuf Backward Compatibility	9s
Protocol Schema	1m 20s
Backward Compatibility	1s
Database Migration	1s
Genesis Changes	1s
Sanity Checks	1s
Upgradability	1s
Style	39s
Windows check for building public libraries	1m 13s
Generate Coverage Artifact	1s
Upload Coverage	1s
	9m 3s

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