Fix a few lints introducedin Rust 1.77 #858

Job	Run time
test (ubuntu-latest, stable)	22s
linting (stable)	51s
test (ubuntu-latest, beta)	1m 9s
linting (beta)	53s
documentation	4m 3s
test (windows-latest, stable)	1m 15s
features (--no-default-features)	49s
test (windows-latest, beta)	2m 28s
features (--no-default-features --features serialization)	45s
features (--no-default-features --features serial)	1m 7s
features (--no-default-features --features tls)	57s
bindings-macos (x86_64-apple-darwin)	2m 0s
bindings-linux (x86_64-unknown-linux-gnu)	2m 43s
bindings-windows (x86_64-pc-windows-msvc, true)	5m 13s
bindings-linux (i686-unknown-linux-gnu)	2m 53s
bindings-windows (i686-pc-windows-msvc, false)	2m 11s
guide	1m 23s
bindings-linux (x86_64-unknown-linux-musl)	2m 41s
bindings-linux (arm-unknown-linux-gnueabihf)	2m 39s
bindings-linux (arm-unknown-linux-musleabihf)	2m 45s
conformance	6m 0s
bindings-linux (aarch64-unknown-linux-gnu)	2m 46s
bindings-linux (aarch64-unknown-linux-musl)	2m 44s
bindings-linux (armv7-unknown-linux-gnueabihf)	2m 39s
bindings-linux (arm-unknown-linux-gnueabi)	2m 35s
packaging	1s
release	1s
	55m 53s

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