examples: Update to diesel-async 0.7 (#3518) #5805

Job	Run time
dependencies-are-sorted	4s
cargo-public-api-crates (axum-core)	25s
check	1m 0s
cargo-public-api-crates (axum-macros)	21s
cargo-deny check (bans licenses sources)	34s
Spell Check with Typos	6s
cargo-public-api-crates (axum)	42s
cargo-public-api-crates (axum-extra)	36s
check-docs	33s
cargo-deny check (advisories)	25s
cargo-hack	3m 37s
test-nightly	1m 16s
test-versions (beta)	1m 44s
test-msrv	2m 39s
test-versions (stable)	1m 55s
test-docs	1m 15s
armv5te-unknown-linux-musleabi	1m 0s
wasm32-unknown-unknown	28s
	18m 40s

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