Bump go.opentelemetry.io/build-tools/multimod in /internal/tools (#97)

Bumps [go.opentelemetry.io/build-tools/multimod](https://github.com/open-telemetry/opentelemetry-go-build-tools) from 0.0.0-20220327151007-0b1d24fa04f4 to 0.6.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-go-build-tools/releases)
- [Commits](https://github.com/open-telemetry/opentelemetry-go-build-tools/commits/v0.6.0)

---
updated-dependencies:
- dependency-name: go.opentelemetry.io/build-tools/multimod
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

internal/tools/go.mod

@@ -4,5 +4,5 @@ go 1.16
 
 require (
 	go.opentelemetry.io/build-tools/dbotconf v0.6.0
-	go.opentelemetry.io/build-tools/multimod v0.0.0-20220327151007-0b1d24fa04f4
+	go.opentelemetry.io/build-tools/multimod v0.6.0
 )