Bump src/vendor/pypa/get-pip from `57875d1` to `57b648e`
Bump src/vendor/pypa/get-pip from `57875d1` to `57b648e`

Bumps [src/vendor/pypa/get-pip](https://github.com/pypa/get-pip) from `57875d1` to `57b648e`.
- [Release notes](https://github.com/pypa/get-pip/releases)
- [Commits](https://github.com/pypa/get-pip/compare/57875d1e15ded2de0c417f02500cbf9ec1dfd95f...57b648ef9b98f7324b8cdc61d68966cad0a2473f)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
plus3it/watchmaker,plus3it/watchmaker