Fix crash blocking inside tokio. Fixes #1017 #1878

Job	Run time
Check Style	13s
Android	26s
linux / nightly	1m 21s
MSRV	2m 58s
unstable features	13s
linux / stable	50s
WASM	56s
linux / beta	1m 2s
macOS / stable	2m 24s
windows / stable-x86_64-msvc	2m 43s
windows / stable-i686-msvc	2m 52s
windows / stable-x86_64-gnu	7m 50s
windows / stable-i686-gnu	8m 9s
feat.: default-tls disabled	1m 27s
feat.: rustls-tls	54s
feat.: rustls-tls-manual-roots	57s
feat.: rustls-tls-native-roots	53s
feat.: native-tls	57s
feat.: default-tls and rustls-tls	1m 14s
feat.: cookies	1m 5s
feat.: blocking	1m 11s
feat.: blocking only	1m 6s
feat.: gzip	1m 3s
feat.: brotli	1m 10s
feat.: deflate	58s
feat.: json	59s
feat.: multipart	55s
feat.: stream	49s
feat.: socks/default-tls	56s
feat.: socks/rustls-tls	1m 4s
feat.: hickory-dns	1m 6s
Docs	1m 40s
CI is green	1s
	52m 22s

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