Bump tempfile from 3.14.0 to 3.15.0 #6221

Job	Run time
Check	22s
Check if cbindgen runs cleanly for generating the C headers	8m 1s
coverage	9m 4s
Lints (beta)	31s
minimum_rust_version	6m 54s
Publish (on tags, dry-run otherwise)	7m 55s
Lints (stable)	24s
test (beta)	1m 25s
test_all_features	12m 25s
Run tests under wasm32-wasi	1m 11s
test (stable)	1m 22s
test (windows)	3m 29s
Check if wasm-pack builds a valid package for the sourmash crate	1m 21s
test (macos)	1m 14s
	55m 38s

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