Bump toml from 0.7.6 to 0.8.8 #2774

Job	Run time
Format	7s
Check (stable)	55s
Clippy	1m 1s
Check (1.70.0)	1m 15s
Cross (aarch64-linux-android)	2m 31s
Deny (advisories)	21s
Cross (aarch64-unknown-linux-gnu)	2m 20s
Deny (bans licenses sources)	20s
Documentation	1m 9s
Cross (aarch64-unknown-linux-musl)	2m 34s
Hack	1m 48s
Lint markdown files	59s
Tests	4m 5s
Tools	2m 19s
	21m 44s

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