chore(deps): bump the go group across 1 directory with 5 updates

Bumps the go group with 5 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [github.com/davecgh/go-spew](https://github.com/davecgh/go-spew) | `1.1.0` | `1.1.1` |
| [github.com/evanphx/json-patch](https://github.com/evanphx/json-patch) | `0.5.2` | `5.9.0+incompatible` |
| [github.com/mitchellh/mapstructure](https://github.com/mitchellh/mapstructure) | `1.4.1` | `1.5.0` |
| [github.com/stretchr/testify](https://github.com/stretchr/testify) | `1.6.1` | `1.9.0` |
| [golang.org/x/oauth2](https://github.com/golang/oauth2) | `0.0.0-20210413134643-5e61552d6c78` | `0.20.0` |



Updates `github.com/davecgh/go-spew` from 1.1.0 to 1.1.1
- [Commits](davecgh/go-spew@v1.1.0...v1.1.1)

Updates `github.com/evanphx/json-patch` from 0.5.2 to 5.9.0+incompatible
- [Release notes](https://github.com/evanphx/json-patch/releases)
- [Commits](evanphx/json-patch@v0.5.2...v5.9.0)

Updates `github.com/mitchellh/mapstructure` from 1.4.1 to 1.5.0
- [Changelog](https://github.com/mitchellh/mapstructure/blob/main/CHANGELOG.md)
- [Commits](mitchellh/mapstructure@v1.4.1...v1.5.0)

Updates `github.com/stretchr/testify` from 1.6.1 to 1.9.0
- [Release notes](https://github.com/stretchr/testify/releases)
- [Commits](stretchr/testify@v1.6.1...v1.9.0)

Updates `golang.org/x/oauth2` from 0.0.0-20210413134643-5e61552d6c78 to 0.20.0
- [Commits](https://github.com/golang/oauth2/commits/v0.20.0)

---
updated-dependencies:
- dependency-name: github.com/davecgh/go-spew
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: go
- dependency-name: github.com/evanphx/json-patch
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: go
- dependency-name: github.com/mitchellh/mapstructure
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: go
- dependency-name: github.com/stretchr/testify
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: go
- dependency-name: golang.org/x/oauth2
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: go
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -3,11 +3,11 @@ module github.com/labd/amplience-go-sdk
 go 1.15
 
 require (
-	github.com/davecgh/go-spew v1.1.0
-	github.com/evanphx/json-patch v0.5.2
-	github.com/mitchellh/mapstructure v1.4.1
-	github.com/stretchr/testify v1.6.1
-	golang.org/x/lint v0.0.0-20201208152925-83fdc39ff7b5 // indirect
-	golang.org/x/oauth2 v0.0.0-20210413134643-5e61552d6c78
-	golang.org/x/tools v0.1.0 // indirect
+	github.com/evanphx/json-patch v5.9.0+incompatible
+	github.com/kr/pretty v0.1.0 // indirect
+	github.com/mitchellh/mapstructure v1.5.0
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/stretchr/testify v1.9.0
+	golang.org/x/oauth2 v0.20.0
+	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 )