chore(deps): update terraform terraform-ibm-modules/cos/ibm to v8.2.1

[terraform-ibm-modules-ops]

This PR contains the following updates:

Package	Type	Update	Change
terraform-ibm-modules/cos/ibm (source)	module	patch	8.2.0 -> 8.2.1

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Release Notes

terraform-ibm-modules/terraform-ibm-cos (terraform-ibm-modules/cos/ibm)

### [`v8.2.1`](https://togithub.com/terraform-ibm-modules/terraform-ibm-cos/releases/tag/v8.2.1) [Compare Source](https://togithub.com/terraform-ibm-modules/terraform-ibm-cos/compare/v8.2.0...v8.2.1) ##### Bug Fixes - validation to allow null values ([#​599](https://togithub.com/terraform-ibm-modules/terraform-ibm-cos/issues/599)) ([f45883e](https://togithub.com/terraform-ibm-modules/terraform-ibm-cos/commit/f45883e7b5933de979e9ae49a987f9cbbbbc4bc4))

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[terraform-ibm-modules-dev]

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[terraform-ibm-modules-dev]

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[terraform-ibm-modules-dev]

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[terraform-ibm-modules-ops]

:tada: This PR is included in version 7.18.1 :tada:

The release is available on GitHub release

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