Update Terraform cloudposse/label/null to v0.24.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
cloudposse/label/null (source)	terraform	patch	0.24.0 -> 0.24.1

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Release Notes

cloudposse/terraform-null-label

### [`v0.24.1`](https://togithub.com/cloudposse/terraform-null-label/releases/0.24.1) [Compare Source](https://togithub.com/cloudposse/terraform-null-label/compare/0.24.0...0.24.1)

Allow control of letter case of outputs @​SweetOps (#​107)

You now have control over the letter case of generated tag names and supplied labels, which means you also have control over the letter case of the ultimate `id`. Labels are the elements you can include in `label_order`, namely `namespace`, `environment`, `stage`, `name`, and `attributes`. For every non-empty label, a corresponding tag name is generated. For `namespace`, `environment`, `stage`, the output is the formatted, normalized input. (By "normalized" we mean that it goes through `regex_replace_chars`.), For `attributes`, which is a list, each element is normalized, duplicates are removed, and the resulting list is converted to a string by joining the elements with the `delimiter` (defaults to hyphen). For `name`, which is special, the output is the same as `id`, which is the joining of the labels in the order specified by `label_order` and separated by `delimiter`. - You can set `label_key_case` to one of `upper`, `lower`, or `title`, which will result in generated `tag` names in the corresponding case: `NAME`, `name`, or `Name`. For backwards compatibility, `title` is the default - You can set `label_value_case` to one of `upper`, `lower`, `title`, or `none`, which will result in output label values in the corresponding case (with `none` meaning no case conversion of any kind will be done, though the labels will still be subject to `regex_replace_chars`). The case converted labels will show up not just in the module output of the labels themselves, but also in the `tag` values and in the `id` string. You can look at the test cases in `examples/complete` and the expected results in `test/src/examples_complete_test.go` to see examples of how this is supposed to work. One interesting example is that you can create `id`s in Pascal case by setting `label_value_case = "title"` and `delimiter = ""`.

Include updates to exports/context.tf @​Nuru (#​122 and #​123)

##### what - Include updates to `exports/context.tf` - Update README with features and compatibilty - Add validation for `id_length_limit` ##### why - The `exports/context.tf` is what gets distributed and needs to be in sync - Replace outdated information - Was not validated earlier because validators are not supported in TF 0.12 but now we are dropping support for TF 0.12 and so we can add validators

Restore backward compatibility with v0.22.1 and earlier @​Nuru (#​121)

##### what - Restore backward compatibility with v0.22.1 and earlier - Allow setting of `label_key_case` and `label_value_case` by vars, not just by context attributes. ##### why - Allow interoperability of old and new modules - Normally, root modules make settings via individual variables, not by setting an entire context block. Incorporates and closes [#​120](https://togithub.com/cloudposse/terraform-null-label/issues/120)

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