Rust

Bump MSRV to 1.65 and fix warnings #202

Job	Run time
Style Checks (rustfmt)	13s
Unit and Doc Tests (Rust MSRV on ubuntu-latest)	4m 11s
Code Coverage (stable/ubuntu-latest)	4m 15s
Style Check (clippy)	49s
Unit and Doc Tests (Rust MSRV on windows-latest)	5m 33s
Integration Tests (Rust Stable with curl-client)	1m 0s
Unit and Doc Tests (Rust MSRV on macOS-latest)	7m 38s
Integration Tests (Rust Stable with h1-client)	58s
README Format Check	1m 11s
Unit and Doc Tests (Rust Stable on ubuntu-latest)	33s
Integration Tests (Rust Stable with h1-client-rustls)	1m 9s
Integration Tests (Rust Stable with hyper-client)	1m 8s
Unit and Doc Tests (Rust Stable on windows-latest)	1m 38s
Unit and Doc Tests (Rust Stable on macOS-latest)	54s
Integration Tests (Rust Stable with reqwest-client)	43s
Unit and Doc Tests (Rust Beta on ubuntu-latest)	24s
Integration Tests (Rust Stable with reqwest-client-rustls)	45s
Unit and Doc Tests (Rust Beta on windows-latest)	1m 0s
Unit and Doc Tests (Rust Beta on macOS-latest)	49s
Unit and Doc Tests (Rust Nightly on ubuntu-latest)	26s
Unit and Doc Tests (Rust Nightly on windows-latest)	1m 17s
Unit and Doc Tests (Rust Nightly on macOS-latest)	42s
pages	0s
	37m 16s

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