[Process] Add deprecated logs on Process::setInput() and ProcessBuilder::setInput().

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | #12703 
| License       | MIT
| Doc PR        | 
please format it this way: https://github.com/symfony/symfony/blob/95b117c235cc0a8b79be0c27825978c1a930c1da/src/Symfony/Component/PropertyAccess/PropertyAccess.php#L51