Update Terraform cloudposse/label/null to v0.24.1

[renovate]

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

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for `id_length_limit` #### why - The `exports/context.tf` is what gets distributed and needs to be in sync - Replace outdated information - Was not validated earlier because validators are not supported in TF 0.12 but now we are dropping support for TF 0.12 and so we can add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

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