feat: update nullplatform provider to >= 0.0.86 across all modules

[davidf-null]

Summary

• Updated nullplatform/nullplatform provider version to >= 0.0.86 across 23 modules
• Updated .terraform.lock.hcl files accordingly
• Added dimensions = {} in asset/ecr (required by provider >= 0.0.86)

Updated modules

Module	Previous version	New version
metrics	~> 0.0.63	>= 0.0.86
service_definition	~> 0.0.67	>= 0.0.86
asset/ecr	~> 0.0.63	>= 0.0.86
asset/docker_server	>= 0.0.67	>= 0.0.86
scope_definition_agent_association	>= 0.0.67	>= 0.0.86
api_key	~> 0.0.76	>= 0.0.86
container_orchestration/oke	~> 0.0.63	>= 0.0.86
container_orchestration/aks	~> 0.0.63	>= 0.0.86
container_orchestration/gke	~> 0.0.63	>= 0.0.86
container_orchestration/eks	~> 0.0.63	>= 0.0.86
agent	~> 0.0.63	>= 0.0.86
service_definition_agent_association	~> 0.0.67	>= 0.0.86
code_repository	~> 0.0.67	>= 0.0.86
users	~> 0.0.63	>= 0.0.86
cloud/azure/cloud	~> 0.0.63	>= 0.0.86
cloud/oci/cloud	~> 0.0.63	>= 0.0.86
cloud/gcp/cloud	~> 0.0.63	>= 0.0.86
cloud/aws/cloud	~> 0.0.63	>= 0.0.86
cloud/aws/vpc	~> 0.0.63	>= 0.0.86
scope_definition	~> 0.0.63	>= 0.0.86
account	~> 0.0.63	>= 0.0.86
dimensions	~> 0.0.63	>= 0.0.86
base	~> 0.0.76	>= 0.0.86

Notes

• asset/ecr: added dimensions = {} as provider >= 0.0.86 marks it as Required: true. ECR does not use dimensions so it is left empty.
• All pre-commit hooks pass (tofu fmt, tofu validate, tofu test).

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