Bump github.com/unistack-org/micro/v3 from 3.7.1 to 3.7.3

Bumps [github.com/unistack-org/micro/v3](https://github.com/unistack-org/micro) from 3.7.1 to 3.7.3.
- [Release notes](https://github.com/unistack-org/micro/releases)
- [Commits](https://github.com/unistack-org/micro/compare/v3.7.1...v3.7.3)

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

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

go.mod

@@ -4,5 +4,5 @@ go 1.16
 
 require (
 	github.com/imdario/mergo v0.3.12
-	github.com/unistack-org/micro/v3 v3.7.1
+	github.com/unistack-org/micro/v3 v3.7.3
 )