Fix .gitmodules to use https for Terraform mapper (#1588)
Fix .gitmodules to use https for Terraform mapper (#1588)

Fixes https://github.com/GoogleCloudPlatform/magic-modules/issues/1586

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# [all]
## [terraform]
### [terraform-beta]
## [ansible]
## [inspec]

GoogleCloudPlatform/magic-modules,GoogleCloudPlatform/magic-modules,GoogleCloudPlatform/magic-modules,GoogleCloudPlatform/magic-modules,GoogleCloudPlatform/magic-modules