build(deps): bump github.com/prometheus/client_golang from 1.20.3 to 1.20.4 #1947

Job	Run time
Run go tests	1m 7s
Lint golang code	8s
Lint bash code with shellcheck	3s
End-to-End test with kured with code and manifests from HEAD (command) (1.28)	16m 26s
Check docs for incorrect links	7s
End-to-End test with kured with code and manifests from HEAD (command) (1.29)	15m 36s
End-to-End test with kured with code and manifests from HEAD (signal) (1.28)	1m 31s
End-to-End test with kured with code and manifests from HEAD (concurrent) (1.28)	11m 45s
End-to-End test with kured with code and manifests from HEAD (command) (1.30)	17m 6s
End-to-End test with kured with code and manifests from HEAD (signal) (1.29)	16m 44s
End-to-End test with kured with code and manifests from HEAD (signal) (1.30)	15m 32s
End-to-End test with kured with code and manifests from HEAD (concurrent) (1.29)	10m 28s
Build image and scan it against known vulnerabilities	1m 25s
End-to-End test with kured with code and manifests from HEAD (concurrent) (1.30)	11m 40s
	1h 59m 38s

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