fix(deps): update module github.com/hashicorp/terraform-plugin-sdk/v2 to v2.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/hashicorp/terraform-plugin-sdk/v2	require	minor	v2.20.0 -> v2.21.0

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Release Notes

hashicorp/terraform-plugin-sdk

v2.21.0

Compare Source

NOTES:

• This Go module has been updated to Go 1.18 per the Go support policy. Any consumers building on earlier Go versions may experience errors. (#​1027)

BUG FIXES:

• helper/resource: Fixed TestStep type Taint field usage to properly recreate resources (#​1031)
• helper/schema: Ensured RawConfig, RawPlan, and RawState are correctly copied during planning with recreation (#​1024)

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