Bump github.com/imdario/mergo from 0.3.12 to 0.3.13 (#86)

Bumps [github.com/imdario/mergo](https://github.com/imdario/mergo) from 0.3.12 to 0.3.13.
- [Release notes](https://github.com/imdario/mergo/releases)
- [Commits](https://github.com/imdario/mergo/compare/0.3.12...v0.3.13)

---
updated-dependencies:
- dependency-name: github.com/imdario/mergo
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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

go.mod

@@ -3,7 +3,7 @@ module go.unistack.org/micro-config-service/v3
 go 1.16
 
 require (
-	github.com/imdario/mergo v0.3.12
+	github.com/imdario/mergo v0.3.13
 	go.unistack.org/micro/v3 v3.9.8
 	google.golang.org/grpc v1.46.0
 	google.golang.org/protobuf v1.28.0