Bump github.com/hashicorp/terraform-exec from 0.15.0 to 0.16.0 (#868)

Bumps [github.com/hashicorp/terraform-exec](https://github.com/hashicorp/terraform-exec) from 0.15.0 to 0.16.0.
- [Release notes](https://github.com/hashicorp/terraform-exec/releases)
- [Changelog](https://github.com/hashicorp/terraform-exec/blob/main/CHANGELOG.md)
- [Commits](hashicorp/terraform-exec@v0.15.0...v0.16.0)

---
updated-dependencies:
- dependency-name: github.com/hashicorp/terraform-exec
  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>

go.mod

@@ -3,11 +3,9 @@ module github.com/hashicorp/terraform-plugin-sdk/v2
 go 1.16
 
 require (
-	cloud.google.com/go v0.61.0 // indirect
 	github.com/agext/levenshtein v1.2.2 // indirect
 	github.com/apparentlymart/go-cidr v1.1.0
 	github.com/apparentlymart/go-dump v0.0.0-20190214190832-042adf3cf4a0
-	github.com/aws/aws-sdk-go v1.25.3 // indirect
 	github.com/davecgh/go-spew v1.1.1
 	github.com/google/go-cmp v0.5.7
 	github.com/hashicorp/go-cty v1.4.1-0.20200414143053-d3edf31b6320
@@ -19,7 +17,7 @@ require (
 	github.com/hashicorp/hc-install v0.3.1
 	github.com/hashicorp/hcl/v2 v2.3.0
 	github.com/hashicorp/logutils v1.0.0
-	github.com/hashicorp/terraform-exec v0.15.0
+	github.com/hashicorp/terraform-exec v0.16.0
 	github.com/hashicorp/terraform-json v0.13.0
 	github.com/hashicorp/terraform-plugin-go v0.7.0
 	github.com/hashicorp/terraform-plugin-log v0.2.1
@@ -34,5 +32,7 @@ require (
 	github.com/zclconf/go-cty v1.10.0
 	golang.org/x/crypto v0.0.0-20210616213533-5ff15b29337e
 	golang.org/x/tools v0.0.0-20200713011307-fd294ab11aed
+	google.golang.org/appengine v1.6.6 // indirect
+	google.golang.org/genproto v0.0.0-20200711021454-869866162049 // indirect
 	google.golang.org/grpc v1.43.0
 )