Update module hashicorp/terraform-plugin-sdk to v2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
hashicorp/terraform-plugin-sdk	require	major	v1.15.0 -> v2.4.3

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Release Notes

hashicorp/terraform-plugin-sdk

v2.4.3

Compare Source

v2.4.2

Compare Source

v2.4.1

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v2.4.0

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v2.3.0

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v2.2.0

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v2.1.0

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v2.0.4

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v2.0.3

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v2.0.2

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v2.0.1

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v2.0.0

Compare Source

v1.16.0

Compare Source

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻️ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you check the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: go.sum

Command failed: docker run --rm --name=renovate_go --label=renovate_child -v "/mnt/renovate/gh/koalificationio/terraform-provider-webhookrelay":"/mnt/renovate/gh/koalificationio/terraform-provider-webhookrelay" -v "/tmp/renovate-cache":"/tmp/renovate-cache" -v "/tmp/renovate-cache/others/go":"/tmp/renovate-cache/others/go" -e GOPATH -e CGO_ENABLED -w "/mnt/renovate/gh/koalificationio/terraform-provider-webhookrelay" docker.io/renovate/go:1.13.15 bash -l -c "git config --global url.\"https://**redacted**@github.com/\".insteadOf \"https://github.com/\" && go get -d ./... && go mod tidy && go mod vendor && go mod tidy && go mod tidy"
go: github.com/hashicorp/terraform-plugin-sdk/v2/v2@v2.4.3: reading github.com/hashicorp/terraform-plugin-sdk/v2/v2/go.mod at revision v2/v2.4.3: unknown revision v2/v2.4.3