Block AzAPI provider >= 2.0.0

[jkroepke]

azure/azapi introduced a breaking change in 2.0 where JSON output is replaced by native HCL output.

Since the output type is changes from string to complex, jsondecode does not longer work

Planning failed. Terraform encountered an error while generating this plan.

╷
│ Error: Invalid function argument
│ 
│   on .terraform/modules/vm-relc-a-p-1/d-image.tf line 52, in locals:
│   52:     jsondecode(one(data.azapi_resource_list.virtual_machine_images[*].output)) :
│     ├────────────────
│     │ while calling jsondecode(str)
│     │ data.azapi_resource_list.virtual_machine_images is tuple with 1 element
│ 
│ Invalid value for "str" parameter: string required.
╵

Error: Process completed with exit code 1.

[jkroepke]

This is just an preventive fix, since 2.0.0 is not GA yet.