Fix a few lints introducedin Rust 1.77 #860

Job	Run time
conformance	10m 1s
bindings-macos (x86_64-apple-darwin)	2m 36s
bindings-windows (x86_64-pc-windows-msvc, true)	7m 23s
bindings-windows (i686-pc-windows-msvc, false)	2m 38s
bindings-linux (x86_64-unknown-linux-gnu)	2m 35s
bindings-linux (i686-unknown-linux-gnu)	2m 39s
documentation	4m 24s
features (--no-default-features)	49s
bindings-linux (x86_64-unknown-linux-musl)	2m 41s
features (--no-default-features --features serialization)	53s
bindings-linux (arm-unknown-linux-gnueabihf)	2m 40s
guide	1m 13s
features (--no-default-features --features serial)	1m 13s
bindings-linux (arm-unknown-linux-musleabihf)	2m 54s
features (--no-default-features --features tls)	58s
bindings-linux (aarch64-unknown-linux-gnu)	2m 46s
linting (stable)	57s
bindings-linux (aarch64-unknown-linux-musl)	2m 47s
linting (beta)	54s
bindings-linux (armv7-unknown-linux-gnueabihf)	2m 40s
test (ubuntu-latest, stable)	42s
bindings-linux (arm-unknown-linux-gnueabi)	2m 36s
test (ubuntu-latest, beta)	42s
test (windows-latest, stable)	1m 49s
test (windows-latest, beta)	1m 47s
packaging	14s
release	1s
	1h 3m 32s

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