build(deps): bump github.com/jarcoal/httpmock in /frontend

Bumps [github.com/jarcoal/httpmock](https://github.com/jarcoal/httpmock) from 1.3.1 to 1.4.0.
- [Release notes](https://github.com/jarcoal/httpmock/releases)
- [Commits](https://github.com/jarcoal/httpmock/compare/v1.3.1...v1.4.0)

---
updated-dependencies:
- dependency-name: github.com/jarcoal/httpmock
  dependency-version: 1.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

frontend/go.mod

@@ -5,7 +5,7 @@ go 1.17
 require (
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
 	github.com/gorilla/handlers v1.5.2
-	github.com/jarcoal/httpmock v1.3.1
+	github.com/jarcoal/httpmock v1.4.0
 	github.com/magiconair/properties v1.8.9
 	github.com/spf13/pflag v1.0.6
 	github.com/spf13/viper v1.19.0