Bump packer azure plugin version to 2.1.8

[jenkins-infra-updatecli]

Bump packer azure plugin version

Update the azure plugin version in main.pkr.hcl

1 file(s) updated with "azure = {${1}version = \"2.1.8\"": * main.pkr.hcl

2.1.8

Release published on the 2024-08-26 17:06:19 +0000 UTC at the url https://github.com/hashicorp/packer-plugin-azure/releases/tag/v2.1.8

<!-- Release notes generated using configuration in .github/release.yml at v2.1.8 -->

## What's Changed
### Doc improvements 📚
* Add docs for `target_region` replicas field, make error message for it clearer by @JenGoldstrich in https://github.com/hashicorp/packer-plugin-azure/pull/437
### Other Changes
* Fix `replicated_regions` not using `shared_image_gallery_replica_count` for build location when its specified in the list by @JenGoldstrich in https://github.com/hashicorp/packer-plugin-azure/pull/438
* Add Subscription ID and Tenant ID to build variables by @JenGoldstrich in https://github.com/hashicorp/packer-plugin-azure/pull/439
* chore: update `version.go` by @tenthirtyam in https://github.com/hashicorp/packer-plugin-azure/pull/435

## New Contributors
* @tenthirtyam made their first contribution in https://github.com/hashicorp/packer-plugin-azure/pull/435

**Full Changelog**: https://github.com/hashicorp/packer-plugin-azure/compare/v2.1.7...v2.1.8

Jenkins pipeline link

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