cargo-semver-checks is failing on Key Vault SDK

Seems [`cargo-semver-checks` is not checking out symlinks](https://github.com/obi1kenobi/cargo-semver-checks/issues/1718), which fails for Key Vault Secrets and Certificates because they symlink `authorizer.rs` from Keys:

```
error[E0583]: file not found for module `authorizer`
--> /home/heaths/src/azure-sdk-for-rust/target/semver-checks/git-azure_security_keyvault_secrets_1_0_0/fd2cf10e8968554dafe01a113374bbd97b4eadbb/sdk/keyvault/azure_security_keyvault_secrets/src/lib.rs:7:1
|
7 | mod authorizer;
| ^^^^^^^^^^^^^^^
|
```

## Proposal

Instead of symlinking, we could copy these; however, it's not going to help the case for any version of Secrets or Certificates where it was still a symlink. I'd prefer getting (or even making) a fix upstream in `cargo-semver-checks`.