Bump go.opentelemetry.io/contrib in /instrumentation/host

Bumps [go.opentelemetry.io/contrib](https://github.com/open-telemetry/opentelemetry-go-contrib) from 0.15.1 to 0.18.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-go-contrib/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-go-contrib/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-go-contrib@v0.15.1...v0.18.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

instrumentation/host/go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/go-ole/go-ole v1.2.4 // indirect
 	github.com/shirou/gopsutil v2.20.9+incompatible
 	github.com/stretchr/testify v1.6.1
-	go.opentelemetry.io/contrib v0.15.1
+	go.opentelemetry.io/contrib v0.18.0
 	go.opentelemetry.io/otel v0.15.0
 	golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a // indirect
 )