chore(deps): bump worker_bucket::terraform-ibm-cos from 7.0.0 to 8.1.9

Bumps [worker_bucket::terraform-ibm-cos](https://github.com/terraform-ibm-modules/terraform-ibm-cos) from 7.0.0 to 8.1.9.
- [Release notes](https://github.com/terraform-ibm-modules/terraform-ibm-cos/releases)
- [Changelog](https://github.com/terraform-ibm-modules/terraform-ibm-cos/blob/main/.releaserc)
- [Commits](terraform-ibm-modules/terraform-ibm-cos@v7.0.0...v8.1.9)

---
updated-dependencies:
- dependency-name: worker_bucket::github::terraform-ibm-modules/terraform-ibm-cos::v7.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

main.tf

@@ -130,7 +130,7 @@ module "cos" {
 module "worker_bucket" {
   create_cos_instance      = false
   depends_on               = [module.cos]
-  source                   = "git::https://github.com/terraform-ibm-modules/terraform-ibm-cos?ref=v7.0.0"
+  source                   = "git::https://github.com/terraform-ibm-modules/terraform-ibm-cos?ref=v8.1.9"
   resource_group_id        = local.resource_group_id
   region                   = var.region
   bucket_name              = "${local.prefix}-${local.vpc_zones[0].zone}-worker-collector-bucket"