Bump memfd from 0.6.3 to 0.6.4 #2845

Job	Run time
Clippy	1m 19s
Check (stable)	1m 42s
Documentation	1m 14s
Cross (aarch64-linux-android)	3m 24s
Check (1.70.0)	1m 16s
Deny (advisories)	21s
Deny (bans licenses sources)	39s
Format	24s
Cross (aarch64-unknown-linux-gnu)	3m 17s
Hack	2m 27s
Cross (aarch64-unknown-linux-musl)	3m 8s
Lint markdown files	48s
Tests	4m 41s
Tools	2m 32s
	27m 12s

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