Upgrade the Vault EKM provider

[!IMPORTANT]
Documentation Update: Product documentation, which were located in this repository under /website, are now located in hashicorp/web-unified-docs, colocated with all other product documentation. Contributions to this content should be done in the web-unified-docs repo, and not this one. Changes made to /website content in this repo will not be reflected on the developer.hashicorp.com website.

Note: The upgrade process will put the database into maintenance mode and require a restart. It is highly recommended to test this procedure in a staging environment prior to running it on a production database.

Disable the Vault EKM Provider, and verify it is marked disabled:

ALTER CRYPTOGRAPHIC PROVIDER TransitVaultProvider DISABLE;
SELECT * FROM sys.cryptographic_providers;

Install the latest version from releases.hashicorp.com, following the instructions in the installer.
1. If you get a "Files in Use" prompt while running the installer, select "Do not close applications. A reboot will be required", and restart after the installation has completed.

Reload the provider DLL:

ALTER CRYPTOGRAPHIC PROVIDER TransitVaultProvider
    FROM FILE = 'C:\Program Files\HashiCorp\Transit Vault EKM Provider\TransitVaultEKM.dll';

Now re-enable the Vault EKM Provider and verify it is both marked enabled and the version reported matches the version of the installer:
```
ALTER CRYPTOGRAPHIC PROVIDER TransitVaultProvider ENABLE;
SELECT * FROM sys.cryptographic_providers;
```
Finally, restart Microsoft SQL Server.