Bump github.com/prometheus/common from 0.17.0 to 0.20.0

Bumps [github.com/prometheus/common](https://github.com/prometheus/common) from 0.17.0 to 0.20.0.
- [Release notes](https://github.com/prometheus/common/releases)
- [Commits](prometheus/common@v0.17.0...v0.20.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

go.mod

@@ -29,7 +29,7 @@ require (
 	github.com/oklog/run v1.1.0 // indirect
 	github.com/pierrec/lz4 v2.6.0+incompatible // indirect
 	github.com/prometheus/client_golang v1.9.0
-	github.com/prometheus/common v0.17.0
+	github.com/prometheus/common v0.20.0
 	github.com/prometheus/procfs v0.6.0 // indirect
 	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83 // indirect
 	golang.org/x/net v0.0.0-20210220033124-5f55cee0dc0d // indirect