Add region to validation list

[vburckhardt]

Description

Add eu-fr2 as a valid region in the validation check
https://github.com/terraform-ibm-modules/terraform-ibm-app-configuration/blob/main/variables.tf#L16

[abhishek-swe]

@vburckhardt , could you please review and merge this PR?
#249

[ocofaigh]

Approved - will merge as soon as pipeline passes

[ocofaigh]

Fix included in https://github.com/terraform-ibm-modules/terraform-ibm-app-configuration/releases/tag/v1.8.6