Bump downshift from 9.0.6 to 9.0.8 in /web/ui #477

Job	Run time
Go tests	14m 23s
More Go tests	4m 38s
Go tests with previous Go version	7m 32s
Check generated parser	16s
Build Prometheus for common architectures (0)	6m 26s
Build Prometheus for common architectures (1)	6m 5s
Build Prometheus for common architectures (2)	6m 18s
golangci-lint	26s
UI tests	4m 42s
Mixins tests	2m 7s
Go tests on Windows	8m 22s
Build Prometheus for all architectures	0s
fuzzing	0s
codeql / Analyze (javascript)	1m 19s
Report status of build Prometheus for all architectures	0s
Publish UI on npm Registry	1m 38s
Publish release artefacts	0s
Publish main branch artifacts	0s
	1h 4m 12s

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