Bump go.unistack.org/micro/v3 from 3.8.19 to 3.8.20

Bumps [go.unistack.org/micro/v3](https://github.com/unistack-org/micro) from 3.8.19 to 3.8.20.
- [Release notes](https://github.com/unistack-org/micro/releases)
- [Commits](https://github.com/unistack-org/micro/compare/v3.8.19...v3.8.20)

---
updated-dependencies:
- dependency-name: go.unistack.org/micro/v3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

go.mod

@@ -3,6 +3,6 @@ module go.unistack.org/micro-codec-yaml/v3
 go 1.16
 
 require (
-	go.unistack.org/micro/v3 v3.8.19
+	go.unistack.org/micro/v3 v3.8.20
 	sigs.k8s.io/yaml v1.3.0
 )