build(deps): bump github.com/hashicorp/terraform-json (#431)

Bumps [github.com/hashicorp/terraform-json](https://github.com/hashicorp/terraform-json) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/hashicorp/terraform-json/releases)
- [Commits](https://github.com/hashicorp/terraform-json/compare/v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: github.com/hashicorp/terraform-json
  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>
diff --git a/go.mod b/go.mod
index 750d326..48ba172 100644
--- a/go.mod
+++ b/go.mod
@@ -6,7 +6,7 @@
 	github.com/google/go-cmp v0.6.0
 	github.com/hashicorp/go-version v1.6.0
 	github.com/hashicorp/hc-install v0.6.2
-	github.com/hashicorp/terraform-json v0.19.0
+	github.com/hashicorp/terraform-json v0.20.0
 	github.com/zclconf/go-cty v1.14.1
 	github.com/zclconf/go-cty-debug v0.0.0-20191215020915-b22d67c1ba0b
 )
diff --git a/go.sum b/go.sum
index aa37568..f160c6d 100644
--- a/go.sum
+++ b/go.sum
@@ -41,8 +41,8 @@
 github.com/hashicorp/go-version v1.6.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
 github.com/hashicorp/hc-install v0.6.2 h1:V1k+Vraqz4olgZ9UzKiAcbman9i9scg9GgSt/U3mw/M=
 github.com/hashicorp/hc-install v0.6.2/go.mod h1:2JBpd+NCFKiHiu/yYCGaPyPHhZLxXTpz8oreHa/a3Ps=
-github.com/hashicorp/terraform-json v0.19.0 h1:e9DBKC5sxDfiJT7Zoi+yRIwqLVtFur/fwK/FuE6AWsA=
-github.com/hashicorp/terraform-json v0.19.0/go.mod h1:qdeBs11ovMzo5puhrRibdD6d2Dq6TyE/28JiU4tIQxk=
+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/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 h1:BQSFePA1RWJOlocH6Fxy8MmwDt+yVQYULKfN0RoTN8A=
 github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99/go.mod h1:1lJo3i6rXxKeerYnT8Nvf0QmHCRC1n8sfWVwXF2Frvo=
 github.com/kevinburke/ssh_config v1.2.0 h1:x584FjTGwHzMwvHx18PXxbBVzfnxogHaAReU4gf13a4=