build: make example fails on terraform v1.4.x

[bpg]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Run make example-build && make example-init in the project's root.
2. The init phase fails with

...
Initializing provider plugins...
- Finding hashicorp/local versions matching "2.2.2"...
- Finding bpg/proxmox versions matching "9999.0.0"...
- Finding hashicorp/tls versions matching "3.1.0"...
- Installing hashicorp/local v2.2.2...
- Installed hashicorp/local v2.2.2 (signed by HashiCorp)
- Installing bpg/proxmox v9999.0.0...
- Installing hashicorp/tls v3.1.0...
- Installed hashicorp/tls v3.1.0 (signed by HashiCorp)
╷
│ Error: Failed to install provider
│ 
│ Error while installing bpg/proxmox v9999.0.0: cannot install existing provider directory /<redacted>/terraform-provider-proxmox/cache/plugins/registry.terraform.io/bpg/proxmox/9999.0.0/darwin_arm64 to itself
╵

Expected behavior
The command should complete without errors and should initialize the TF workspace.

Additional context
Works fine on terraform v1.3.9