cap-tempfile: Don't create anonymous files with 0o666 #1820

Job	Run time
Check Cross-Compilation on Rust nightly (nightly)	1m 32s
Check Cross-Compilation on Rust nightly on Windows (nightly)	1m 57s
Check Cross-Compilation (stable)	1m 8s
Check Cross-Compilation on Windows (stable)	1m 59s
Rustfmt	13s
Check Cross-Compilation (beta)	1m 14s
Check Cross-Compilation on Windows (beta)	1m 49s
Test linux-raw support (ubuntu-22.04)	34s
Test with Rust nightly (windows)	2m 2s
Fuzz Targets	55s
Test with Rust nightly (ubuntu)	32s
Test linux-raw support (ubuntu)	33s
Test on Musl (ubuntu)	58s
Test (msrv)	39s
	16m 5s

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