Update module github.com/hashicorp/terraform-plugin-sdk/v2 to v2.16.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/hashicorp/terraform-plugin-sdk/v2	require	minor	v2.15.0 -> v2.16.0

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Release Notes

hashicorp/terraform-plugin-sdk

### [`v2.16.0`](https://togithub.com/hashicorp/terraform-plugin-sdk/releases/v2.16.0) [Compare Source](https://togithub.com/hashicorp/terraform-plugin-sdk/compare/v2.15.0...v2.16.0) ENHANCEMENTS: - helper/resource: Added error logging before failing tests, so errors are visible in test output and any separate log file ([#​958](https://togithub.com/hashicorp/terraform-plugin-sdk/issues/958)) BUG FIXES: - helper/resource: Updated version of [hc-install](github.com/hashicorp/hc-install) in response to change in HashiCorp Release API [sending back a different `Content-Type` header](https://togithub.com/hashicorp/hc-install/issues/56). This was causing failures when the SDK attempted to install Terraform. ([#​960](https://togithub.com/hashicorp/terraform-plugin-sdk/issues/960))

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