feat: support for borsh @ 1.5 #947

Job	Run time
Clippy	49s
Feature checks	46s
Cargo deny check	18s
Docs	50s
Fmt	12s
test (stable, --no-default-features)	1m 22s
test (stable)	1m 27s
test (stable, --all-features)	2m 20s
test (beta, --no-default-features)	1m 34s
test (beta)	1m 31s
test (beta, --all-features)	2m 25s
test (nightly, --no-default-features)	1m 32s
test (nightly)	1m 30s
test (nightly, --all-features)	2m 15s
test (1.65, --no-default-features)	29s
test (1.65)	25s
Accept	0s
	19m 45s

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