`install-prerelease` (packages, dependencies) is not a valid property

Using the `install-prerelease` property in `packages.yml` and `dependencies.yml` results in a runtime error during `dbt deps` execution.

Example `packages.yml`:
```yml
packages:
- package: dbt-labs/dbt_utils
version: ">=1.0.0"
install-prerelease: true
```

Error message:
```
Runtime Error
The packages.yml file in this project is malformed. Please double check
the contents of this file and fix any errors before retrying.

You can find more information on the syntax for this file here:
https://docs.getdbt.com/docs/package-management

Validator Error:
{'package': 'dbt-labs/dbt_utils', 'version': '>=1.0.0', 'install-prerelease': True, 'unrendered': {...}} is not valid under any of the given schemas
```

According to the [documentation](https://docs.getdbt.com/docs/build/packages), the correct property name is `install_prerelease`