Update module github.com/hashicorp/terraform-plugin-testing to v1.6.0

[stackit-pipeline]

This PR contains the following updates:

Package	Type	Update	Change
github.com/hashicorp/terraform-plugin-testing	require	minor	v1.5.1 -> v1.6.0

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Release Notes

hashicorp/terraform-plugin-testing (github.com/hashicorp/terraform-plugin-testing)

v1.6.0

Compare Source

NOTES:

• all: This Go module has been updated to Go 1.20 per the Go support policy. It is recommended to review the Go 1.20 release notes before upgrading. Any consumers building on earlier Go versions may experience errors. (#​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. (#​234)

FEATURES:

• plancheck: Added ExpectUnknownOutputValue built-in plan check, which asserts that a given output value at a specified address is unknown (#​220)
• plancheck: Added ExpectUnknownOutputValueAtPath built-in plan check, which asserts that a given output value at a specified address, and path is unknown (#​220)
• plancheck: Added ExpectNullOutputValue built-in plan check, which asserts that a given output value at a specified address is null (#​220)
• plancheck: Added ExpectNullOutputValueAtPath built-in plan check, which asserts that a given output value at a specified address, and path is null (#​220)

ENHANCEMENTS:

• helper/resource: Removed separate refresh commands, which increases testing performance (#​223)
• helper/resource: Automatically add required_providers configuration to TestStep.Config Terraform language configuration when using Terraform >= 1.0.* (#​216)

BUG FIXES:

• plancheck: Ensured ExpectEmptyPlan and ExpectNonEmptyPlan account for output changes (#​222)
• helper/resource: Ensured TestStep.ExpectNonEmptyPlan accounts for output changes with Terraform 0.14 and later (#​234)

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