Fix rust 1.86 clippy warnings #1026

Job	Run time
Book	3s
Book	3s
Audit	20s
Audit	17s
Check order in Cargo.toml	3s
Check order in Cargo.toml	4s
DevSkim	37s
DevSkim	34s
Docs (rinja)	22s
Docs (rinja)	22s
Jinja2-Assumptions	9s
Jinja2-Assumptions	12s
Docs (rinja_derive)	22s
Docs (rinja_derive)	19s
Rustfmt	14s
Rustfmt	11s
Docs (rinja_parser)	13s
Docs (rinja_parser)	13s
Typos	22s
Typos	26s
Package	0s
MSRV	0s
MSRV	23s
Test	0s
Cluster-Fuzz	0s
Cluster-Fuzz	0s
Fuzz	0s
Fuzz	0s
Test (ubuntu-latest, stable)	1m 23s
Test (ubuntu-latest, beta)	42s
Package (examples/actix-web-app)	48s
Test (macos-latest, stable)	1m 21s
Package (examples/axum-app)	46s
Test (windows-latest, stable)	2m 34s
Package (examples/poem-app)	51s
Package (examples/rocket-app)	57s
Package (examples/salvo-app)	44s
Package (examples/warp-app)	48s
Package (fuzzing)	42s
Package (rinja)	32s
Package (rinja_derive)	23s
Package (rinja_derive_standalone)	16s
Package (rinja_parser)	27s
Package (testing)	13s
Package (testing-alloc)	10s
Package (testing-no-std)	11s
	19m 37s

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