fix(deps): update module github.com/hashicorp/terraform-plugin-docs to v0.19.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/hashicorp/terraform-plugin-docs	v0.19.3 -> v0.19.4

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Release Notes

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

### [`v0.19.4`](https://togithub.com/hashicorp/terraform-plugin-docs/releases/tag/v0.19.4) [Compare Source](https://togithub.com/hashicorp/terraform-plugin-docs/compare/v0.19.3...v0.19.4) NOTES: - validate: The number of files check has been removed to match the latest Terraform Registry ingress logic ([#​381](https://togithub.com/hashicorp/terraform-plugin-docs/issues/381)) BUG FIXES: - generate: Prevented incorrect attribute paths with nested attributes that contain multiple attributes ([#​380](https://togithub.com/hashicorp/terraform-plugin-docs/issues/380))

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Configuration

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