Update dependency gruntwork-io/terragrunt to v0.50.0

This MR contains the following updates:

Package	Type	Update	Change
gruntwork-io/terragrunt	ironbank-github	minor	v0.49.1 -> v0.50.0
gruntwork-io/terragrunt		minor	v0.49.1 -> v0.50.0

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Release Notes

gruntwork-io/terragrunt

v0.50.0

Compare Source

Updated CLI args, config attributes and blocks

• terraform [BACKWARD INCOMPATIBLE]

Description

• Updated the process of passing inputs to Terraform to support inputs with null values.

Related links

• https://github.com/gruntwork-io/terragrunt/pull/2663

Migration guide

To keep passing null values as strings, wrap values in quotes:

inputs = {
  input_1 = "null"
}

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