Bump dawidd6/action-download-artifact from 7 to 8 #1540

Job	Run time
Python 3.8 on win32	2m 51s
Python 3.13 on win32	3m 21s
tests on alpine	1m 13s
Python 3.13t on win32	2m 52s
Python 3.8 on macos-13	1m 9s
Python 3.8 on win64	1m 26s
tests on alpine:aarch64	1m 12s
3.13 on linux, Rust stable	37s
Python 3.8 on macos-latest	1m 34s
tests on ubuntu-rolling:aarch64	1m 6s
Python 3.13 on win64	3m 54s
3.13 on linux, Rust stable	56s
Python 3.13t on win64	3m 46s
Python 3.13 on macos-13	58s
3.8 on linux, Rust stable	51s
3.9 on linux, Rust stable	54s
Python 3.13 on macos-latest	52s
3.10 on linux, Rust stable	52s
Python 3.13t on macos-13	3m 44s
Python 3.13t on macos-latest	1m 33s
3.11 on linux, Rust stable	49s
3.12 on linux, Rust stable	1m 4s
3.13 on linux, Rust stable	1m 0s
3.13t on linux, Rust stable	1m 8s
pypy-3.9 on linux, Rust stable	1m 1s
pypy-3.10 on linux, Rust stable	1m 12s
3.13 on linux, Rust 1.64.0	2m 34s
3.13 on linux, Rust beta	1m 1s
3.13 on linux, Rust nightly	58s
all-green	3s
	46m 31s

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