Bump github.com/prometheus/client_golang from 1.19.1 to 1.20.0 (#349) #856

Job	Run time
Lint code	37s
Lint scripts	3s
Unit test code	40s
Verify that Helm README is up to date	19s
Verify that Makefile section of README is up to date	6s
Lint Helm chart	1s
Verify templating chart with default values	7s
Test integration with Prometheus	2m 1s
Build Linux binary	24s
Build Windows binary	0s
Build Linux ARM binary	0s
Build Mac binary	0s
Build Linux Docker image	32s
Build Linux ARM Docker image	0s
Test integration with Helm chart	2m 35s
Create GitHub release	0s
upload-binaries	0s
	7m 25s

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