feat(tf): update terraform terraform-google-modules/iam/google to v8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
terraform-google-modules/iam/google (source)	module	major	~> 7.6 -> ~> 8.0

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Release Notes

terraform-google-modules/terraform-google-iam (terraform-google-modules/iam/google)

### [`v8.0.0`](https://redirect.github.com/terraform-google-modules/terraform-google-iam/blob/HEAD/CHANGELOG.md#800-2024-09-14) [Compare Source](https://redirect.github.com/terraform-google-modules/terraform-google-iam/compare/v7.7.1...v8.0.0) ##### ⚠ BREAKING CHANGES - added sub-modules for PAM and Secure Source Manager ([#​222](https://redirect.github.com/terraform-google-modules/terraform-google-iam/issues/222)) ##### Features - added sub-modules for PAM and Secure Source Manager ([#​222](https://redirect.github.com/terraform-google-modules/terraform-google-iam/issues/222)) ([87f34e0](https://redirect.github.com/terraform-google-modules/terraform-google-iam/commit/87f34e0995e16e44faaf962a5759ba8ece35a869)) ##### Bug Fixes - Removed Privileged Access Manager(PAM) sub-module ([#​226](https://redirect.github.com/terraform-google-modules/terraform-google-iam/issues/226)) ([d639022](https://redirect.github.com/terraform-google-modules/terraform-google-iam/commit/d63902233d7e1be0f748b165be76d3c4f68d27c5))

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