Fix rust 1.86 clippy warnings #1029

Job	Run time
Docs (rinja)	21s
Check order in Cargo.toml	4s
Audit	17s
Book	5s
Docs (rinja_derive)	26s
Docs (rinja_parser)	12s
DevSkim	34s
Jinja2-Assumptions	12s
Rustfmt	12s
Typos	25s
MSRV	20s
Test (ubuntu-latest, stable)	1m 0s
Package (examples/actix-web-app)	1m 5s
Test (ubuntu-latest, beta)	45s
Package (examples/axum-app)	47s
Test (macos-latest, stable)	54s
Test (windows-latest, stable)	2m 10s
Package (examples/poem-app)	58s
Package (examples/rocket-app)	1m 21s
Package (examples/salvo-app)	1m 12s
Package (examples/warp-app)	1m 6s
Package (fuzzing)	35s
Package (rinja)	41s
Package (rinja_derive)	25s
Package (rinja_derive_standalone)	44s
Package (rinja_parser)	39s
Package (testing)	1m 14s
Package (testing-alloc)	28s
Package (testing-no-std)	25s
Cluster-Fuzz	14m 9s
Fuzz (all)	5m 13s
Fuzz (filters)	5m 15s
Fuzz (html)	5m 10s
Fuzz (parser)	5m 15s
	54m 39s

Provide feedback