Bump github.com/hashicorp/consul/api from 1.14.0 to 1.15.2 (#90)

Bumps [github.com/hashicorp/consul/api](https://github.com/hashicorp/consul) from 1.14.0 to 1.15.2.
- [Release notes](https://github.com/hashicorp/consul/releases)
- [Changelog](https://github.com/hashicorp/consul/blob/main/CHANGELOG.md)
- [Commits](https://github.com/hashicorp/consul/compare/api/v1.14.0...api/v1.15.2)

---
updated-dependencies:
- dependency-name: github.com/hashicorp/consul/api
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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go.mod

@@ -4,7 +4,7 @@ go 1.16
 
 require (
 	github.com/google/btree v1.0.1 // indirect
-	github.com/hashicorp/consul/api v1.14.0
+	github.com/hashicorp/consul/api v1.15.2
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-hclog v1.3.0
 	github.com/hashicorp/go-immutable-radix v1.3.1 // indirect