Update dependency registry1.dso.mil/ironbank/hashicorp/terraform/terraform to v1.2.6

This MR contains the following updates:

Package	Type	Update	Change
registry1.dso.mil/ironbank/hashicorp/terraform/terraform	ironbank-base	patch	1.2.5 -> 1.2.6
registry1.dso.mil/ironbank/hashicorp/terraform/terraform	final	patch	1.2.4 -> 1.2.6

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