Fix a few lints introducedin Rust 1.77 #856

Job	Run time
linting (stable)	49s
features (--no-default-features)	1m 52s
test (ubuntu-latest, stable)	1m 22s
linting (beta)	51s
features (--no-default-features --features serialization)	1m 48s
test (ubuntu-latest, beta)	46s
features (--no-default-features --features serial)	1m 52s
test (windows-latest, stable)	2m 56s
documentation	5m 23s
features (--no-default-features --features tls)	2m 1s
test (windows-latest, beta)	1m 38s
bindings-linux (x86_64-unknown-linux-gnu)	2m 31s
bindings-linux (i686-unknown-linux-gnu)	2m 38s
bindings-macos (x86_64-apple-darwin)	8m 35s
bindings-windows (x86_64-pc-windows-msvc, true)	6m 47s
bindings-linux (x86_64-unknown-linux-musl)	2m 41s
guide	1m 7s
bindings-windows (i686-pc-windows-msvc, false)	4m 19s
bindings-linux (arm-unknown-linux-gnueabihf)	2m 40s
bindings-linux (arm-unknown-linux-musleabihf)	2m 50s
bindings-linux (aarch64-unknown-linux-gnu)	2m 47s
conformance	10m 34s
bindings-linux (aarch64-unknown-linux-musl)	2m 48s
bindings-linux (armv7-unknown-linux-gnueabihf)	2m 41s
bindings-linux (arm-unknown-linux-gnueabi)	2m 40s
packaging	45s
release	0s
	1h 17m 41s

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