Bump memchr from 2.5.0 to 2.6.4 in /native #680

Job	Run time
lint	1m 36s
test (macos-latest, 3.8)	7m 39s
test (macos-latest, 3.9)	9m 49s
coverage	3m 5s
docs	2m 19s
test (macos-latest, 3.10)	6m 50s
test (macos-latest, 3.11)	7m 27s
test (macos-latest, 3.12-dev)	7m 52s
Rust unit tests (ubuntu-latest)	2m 53s
Rust unit tests (macos-latest)	3m 42s
test (ubuntu-latest, 3.8)	1m 16s
Rustfmt	5s
Rust unit tests (windows-latest)	5m 55s
test (ubuntu-latest, 3.9)	3m 18s
test (ubuntu-latest, 3.10)	3m 19s
typecheck	1m 19s
test (ubuntu-latest, 3.11)	3m 33s
test (ubuntu-latest, 3.12-dev)	4m 43s
test (windows-latest, 3.8)	3m 32s
test (windows-latest, 3.9)	5m 56s
test (windows-latest, 3.10)	3m 15s
test (windows-latest, 3.11)	4m 14s
test (windows-latest, 3.12-dev)	3m 17s
	1h 36m 54s

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