Description of problem:
When trying to connect to a SSH server via password authentication, there is no way to enter the password. Instead, the Permission is denied several times before the server disconnects.

Version-Release number of selected component (if applicable):
kitty 0.25.0

How reproducible:
Consistently

Steps to Reproduce:
1. As recommended in the documentation, `alias ssh='kitty +kitten ssh'`
2. `$ ssh -v -o PasswordAuthentication=yes -o PreferredAuthentications=keyboard-interactive,password -o PubkeyAuthentication=no user@server`

Actual results:
```
[...]
debug1: Authentications that can continue: password,keyboard-interactive
debug1: Next authentication method: keyboard-interactive
debug1: read_passphrase: requested to askpass
ssh_askpass: exec(/usr/lib64/kitty/shell-integration/ssh/askpass.py): Permission denied
debug1: read_passphrase: requested to askpass
ssh_askpass: exec(/usr/lib64/kitty/shell-integration/ssh/askpass.py): Permission denied
debug1: Authentications that can continue: password,keyboard-interactive
debug1: read_passphrase: requested to askpass
ssh_askpass: exec(/usr/lib64/kitty/shell-integration/ssh/askpass.py): Permission denied
debug1: read_passphrase: requested to askpass
ssh_askpass: exec(/usr/lib64/kitty/shell-integration/ssh/askpass.py): Permission denied
Received disconnect from [IP] port 22:2: Too many authentication failures for [user]
Disconnected from [IP] port 22
```

Expected results:
```
debug1: Authentications that can continue: password,keyboard-interactive
debug1: Next authentication method: keyboard-interactive
(user@server) Password: 
```
(reading password input)


Additional info:
The problem occurs both with `GNU bash, version 5.1.16(1)-release (x86_64-redhat-linux-gnu)` and `zsh 5.8.1 (x86_64-redhat-linux-gnu)`.

```
$ ls -l /usr/lib64/kitty/shell-integration/ssh/askpass.py                                                 
-rw-r--r--. 1 root root 1398 27. Apr 14:03 /usr/lib64/kitty/shell-integration/ssh/askpass.py
```