Merge bitcoindevkit/rust-esplora-client#103: Remove async std dependency #564

Job	Run time
Rust Formatting	11s
Rust Clippy	4m 8s
Build & Test (stable, default)	3m 47s
Build & Test (stable, blocking)	3m 59s
Build & Test (stable, blocking-https)	3m 13s
Build & Test (stable, blocking-https-rustls)	3m 18s
Build & Test (stable, blocking-https-native)	3m 9s
Build & Test (stable, blocking-https-bundled)	5m 32s
Build & Test (stable, async)	4m 53s
Build & Test (stable, async-https)	3m 27s
Build & Test (stable, async-https-native)	4m 48s
Build & Test (stable, async-https-rustls)	3m 56s
Build & Test (stable, async-https-rustls-manual-roots)	4m 54s
Build & Test (1.63.0, default)	6m 8s
Build & Test (1.63.0, blocking)	5m 34s
Build & Test (1.63.0, blocking-https)	5m 52s
Build & Test (1.63.0, blocking-https-rustls)	5m 45s
Build & Test (1.63.0, blocking-https-native)	5m 36s
Build & Test (1.63.0, blocking-https-bundled)	7m 46s
Build & Test (1.63.0, async)	5m 57s
Build & Test (1.63.0, async-https)	5m 57s
Build & Test (1.63.0, async-https-native)	5m 52s
Build & Test (1.63.0, async-https-rustls)	5m 57s
Build & Test (1.63.0, async-https-rustls-manual-roots)	5m 54s
	1h 55m 33s

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