Add IntoResponse impl to customize-extractor-error example (#2191) #3879

Job	Run time
cargo-public-api-crates (axum)	43s
cargo-public-api-crates (axum-core)	23s
cargo-public-api-crates (axum-extra)	56s
cargo-public-api-crates (axum-macros)	26s
cargo-hack	4m 51s
check-docs	26s
check	57s
cargo-deny check (advisories)	32s
cargo-deny check (bans licenses sources)	33s
dependencies-are-sorted	20s
Spell Check with Typos	5s
test-nightly	2m 40s
test-docs	3m 2s
test-msrv	2m 26s
test-versions (stable)	2m 25s
test-versions (beta)	2m 0s
armv5te-unknown-linux-musleabi	45s
wasm32-unknown-unknown	42s
	24m 12s

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