Bump github.com/hashicorp/terraform-plugin-docs in /tools (#299)

Bumps [github.com/hashicorp/terraform-plugin-docs](https://github.com/hashicorp/terraform-plugin-docs) from 0.17.0 to 0.18.0.
- [Release notes](https://github.com/hashicorp/terraform-plugin-docs/releases)
- [Changelog](https://github.com/hashicorp/terraform-plugin-docs/blob/main/CHANGELOG.md)
- [Commits](hashicorp/terraform-plugin-docs@v0.17.0...v0.18.0)

---
updated-dependencies:
- dependency-name: github.com/hashicorp/terraform-plugin-docs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

tools/go.mod

@@ -4,7 +4,7 @@ go 1.20
 
 require (
 	github.com/hashicorp/copywrite v0.18.0
-	github.com/hashicorp/terraform-plugin-docs v0.17.0
+	github.com/hashicorp/terraform-plugin-docs v0.18.0
 )
 
 require (
@@ -45,7 +45,7 @@ require (
 	github.com/hashicorp/hc-install v0.6.2 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/hashicorp/terraform-exec v0.20.0 // indirect
-	github.com/hashicorp/terraform-json v0.20.0 // indirect
+	github.com/hashicorp/terraform-json v0.21.0 // indirect
 	github.com/henvic/httpretty v0.0.6 // indirect
 	github.com/huandu/xstrings v1.3.3 // indirect
 	github.com/imdario/mergo v0.3.15 // indirect

tools/go.sum

@@ -219,10 +219,10 @@ github.com/hashicorp/memberlist v0.3.0/go.mod h1:MS2lj3INKhZjWNqd3N0m3J+Jxf3DAOn
 github.com/hashicorp/serf v0.9.6/go.mod h1:TXZNMjZQijwlDvp+r0b63xZ45H7JmCmgg4gpTwn9UV4=
 github.com/hashicorp/terraform-exec v0.20.0 h1:DIZnPsqzPGuUnq6cH8jWcPunBfY+C+M8JyYF3vpnuEo=
 github.com/hashicorp/terraform-exec v0.20.0/go.mod h1:ckKGkJWbsNqFKV1itgMnE0hY9IYf1HoiekpuN0eWoDw=
-github.com/hashicorp/terraform-json v0.20.0 h1:cJcvn4gIOTi0SD7pIy+xiofV1zFA3hza+6K+fo52IX8=
-github.com/hashicorp/terraform-json v0.20.0/go.mod h1:qdeBs11ovMzo5puhrRibdD6d2Dq6TyE/28JiU4tIQxk=
-github.com/hashicorp/terraform-plugin-docs v0.17.0 h1:H1Yc+bgB//Geau5g7YKkhG5v9tghI3vplfIYTOl85Uw=
-github.com/hashicorp/terraform-plugin-docs v0.17.0/go.mod h1:cKC8GSLE+0a0bi7LtlpXgrqnlRDCGoGDn15PTEA+Ang=
+github.com/hashicorp/terraform-json v0.21.0 h1:9NQxbLNqPbEMze+S6+YluEdXgJmhQykRyRNd+zTI05U=
+github.com/hashicorp/terraform-json v0.21.0/go.mod h1:qdeBs11ovMzo5puhrRibdD6d2Dq6TyE/28JiU4tIQxk=
+github.com/hashicorp/terraform-plugin-docs v0.18.0 h1:2bINhzXc+yDeAcafurshCrIjtdu1XHn9zZ3ISuEhgpk=
+github.com/hashicorp/terraform-plugin-docs v0.18.0/go.mod h1:iIUfaJpdUmpi+rI42Kgq+63jAjI8aZVTyxp3Bvk9Hg8=
 github.com/hashicorp/vault/api v1.0.4/go.mod h1:gDcqh3WGcR1cpF5AJz/B1UFheUEneMoIospckxBxk6Q=
 github.com/hashicorp/vault/sdk v0.1.13/go.mod h1:B+hVj7TpuQY1Y/GPbCpffmgd+tSEwvhkWnjtSYCaS2M=
 github.com/hashicorp/yamux v0.0.0-20180604194846-3520598351bb/go.mod h1:+NfK9FKeTrX5uv1uIXGdwYDTeHna2qgaIlx54MXqjAM=