deps: update module github.com/hashicorp/terraform-plugin-testing to v1.6.0 (#808)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[github.com/hashicorp/terraform-plugin-testing](https://togithub.com/hashicorp/terraform-plugin-testing)
| require | minor | `v1.5.1` -> `v1.6.0` |

---

### Release Notes

<details>
<summary>hashicorp/terraform-plugin-testing
(github.com/hashicorp/terraform-plugin-testing)</summary>

###
[`v1.6.0`](https://togithub.com/hashicorp/terraform-plugin-testing/releases/tag/v1.6.0)

[Compare
Source](https://togithub.com/hashicorp/terraform-plugin-testing/compare/v1.5.1...v1.6.0)

NOTES:

- all: This Go module has been updated to Go 1.20 per the [Go support
policy](https://go.dev/doc/devel/release#policy). It is recommended to
review the [Go 1.20 release notes](https://go.dev/doc/go1.20) before
upgrading. Any consumers building on earlier Go versions may experience
errors.
([#&#8203;180](https://togithub.com/hashicorp/terraform-plugin-testing/issues/180))
- helper/resource: Configuration based `TestStep` now include post-apply
plan checks for output changes in addition to resource changes. If this
causes unexpected new test failures, most `output` configuration blocks
can be likely be removed. Test steps involving resources and data
sources should never need to use `output` configuration blocks as plan
and state checks support working on resource and data source attributes
values directly.
([#&#8203;234](https://togithub.com/hashicorp/terraform-plugin-testing/issues/234))

FEATURES:

- plancheck: Added `ExpectUnknownOutputValue` built-in plan check, which
asserts that a given output value at a specified address is unknown
([#&#8203;220](https://togithub.com/hashicorp/terraform-plugin-testing/issues/220))
- plancheck: Added `ExpectUnknownOutputValueAtPath` built-in plan check,
which asserts that a given output value at a specified address, and path
is unknown
([#&#8203;220](https://togithub.com/hashicorp/terraform-plugin-testing/issues/220))
- plancheck: Added `ExpectNullOutputValue` built-in plan check, which
asserts that a given output value at a specified address is null
([#&#8203;220](https://togithub.com/hashicorp/terraform-plugin-testing/issues/220))
- plancheck: Added `ExpectNullOutputValueAtPath` built-in plan check,
which asserts that a given output value at a specified address, and path
is null
([#&#8203;220](https://togithub.com/hashicorp/terraform-plugin-testing/issues/220))

ENHANCEMENTS:

- helper/resource: Removed separate refresh commands, which increases
testing performance
([#&#8203;223](https://togithub.com/hashicorp/terraform-plugin-testing/issues/223))
- helper/resource: Automatically add `required_providers` configuration
to `TestStep.Config` Terraform language configuration when using
Terraform >= 1.0.\*
([#&#8203;216](https://togithub.com/hashicorp/terraform-plugin-testing/issues/216))

BUG FIXES:

- plancheck: Ensured `ExpectEmptyPlan` and `ExpectNonEmptyPlan` account
for output changes
([#&#8203;222](https://togithub.com/hashicorp/terraform-plugin-testing/issues/222))
- helper/resource: Ensured `TestStep.ExpectNonEmptyPlan` accounts for
output changes with Terraform 0.14 and later
([#&#8203;234](https://togithub.com/hashicorp/terraform-plugin-testing/issues/234))

</details>

---

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go.mod

@@ -12,7 +12,7 @@ require (
 	github.com/hashicorp/terraform-plugin-log v0.9.0
 	github.com/hashicorp/terraform-plugin-mux v0.13.0
 	github.com/hashicorp/terraform-plugin-sdk/v2 v2.31.0
-	github.com/hashicorp/terraform-plugin-testing v1.5.1
+	github.com/hashicorp/terraform-plugin-testing v1.6.0
 	github.com/hetznercloud/hcloud-go v1.53.0
 	github.com/stretchr/testify v1.8.4
 	golang.org/x/crypto v0.17.0

go.sum

@@ -112,6 +112,8 @@ github.com/hashicorp/terraform-plugin-sdk/v2 v2.31.0 h1:Bl3e2ei2j/Z3Hc2HIS15Gal2
 github.com/hashicorp/terraform-plugin-sdk/v2 v2.31.0/go.mod h1:i2C41tszDjiWfziPQDL5R/f3Zp0gahXe5No/MIO9rCE=
 github.com/hashicorp/terraform-plugin-testing v1.5.1 h1:T4aQh9JAhmWo4+t1A7x+rnxAJHCDIYW9kXyo4sVO92c=
 github.com/hashicorp/terraform-plugin-testing v1.5.1/go.mod h1:dg8clO6K59rZ8w9EshBmDp1CxTIPu3yA4iaDpX1h5u0=
+github.com/hashicorp/terraform-plugin-testing v1.6.0 h1:Wsnfh+7XSVRfwcr2jZYHsnLOnZl7UeaOBvsx6dl/608=
+github.com/hashicorp/terraform-plugin-testing v1.6.0/go.mod h1:cJGG0/8j9XhHaJZRC+0sXFI4uzqQZ9Az4vh6C4GJpFE=
 github.com/hashicorp/terraform-registry-address v0.2.3 h1:2TAiKJ1A3MAkZlH1YI/aTVcLZRu7JseiXNRHbOAyoTI=
 github.com/hashicorp/terraform-registry-address v0.2.3/go.mod h1:lFHA76T8jfQteVfT7caREqguFrW3c4MFSPhZB7HHgUM=
 github.com/hashicorp/terraform-svchost v0.1.1 h1:EZZimZ1GxdqFRinZ1tpJwVxxt49xc/S52uzrw4x0jKQ=