ci: update nightly to nightly-2024-09-15 #719

Job	Run time
stable (ubuntu-latest)	1m 26s
rustfmt	4s
stable (macos-latest)	1m 8s
loom	18s
stable (windows-latest)	2m 46s
cross (i686-unknown-linux-gnu)	25s
cross (armv7-unknown-linux-gnueabihf)	50s
miri	12m 5s
minrust	2m 5s
cross (powerpc-unknown-linux-gnu)	27s
cross (powerpc64-unknown-linux-gnu)	39s
nightly	58s
tsan	1m 18s
cross (wasm32-unknown-unknown)	10s
Publish Documentation	13s
	24m 52s

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