Cannot attach a debugger to Firebase Python Functions

### [REQUIRED] Environment info

**firebase-tools:** 12.9.1

**Platform:** Windows / macOS

### [REQUIRED] Test case

Run emulator with `--inspect-functions` flag:

```
firebase emulators:start --project demo-project --inspect-functions
```

### [REQUIRED] Steps to reproduce

Run emulator with `--inspect-functions` flag:

```
firebase emulators:start --project demo-project --inspect-functions
```

This message appears in the console:

```
> Debugger attached.
! --inspect-functions not supported for Python functions. Ignored.
```

### [REQUIRED] Expected behavior

Debugger would attach to Python functions

### [REQUIRED] Actual behavior

Receive a message in the Console that debugger is not supported