Bump toml from 0.7.6 to 0.8.8 #2772

Job	Run time
Format	7s
Check (stable)	1m 0s
Deny (advisories)	22s
Check (1.70.0)	1m 8s
Clippy	1m 10s
Deny (bans licenses sources)	22s
Cross (aarch64-linux-android)	2m 24s
Documentation	51s
Cross (aarch64-unknown-linux-gnu)	2m 13s
Hack	1m 47s
Lint markdown files	1m 2s
Cross (aarch64-unknown-linux-musl)	2m 16s
Tests	4m 0s
Tools	2m 27s
	21m 9s

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