[communication] SyntaxWarning: "invalid escape sequence"

### Describe the bug

After updating to Azure CLI **2.80.0** (coming from 2.74.0 with clean install), I am seeing multiple `SyntaxWarning: invalid escape sequence` messages when running `communication` extension commands.

While functionality remains intact, these warnings clutter the output.

### Actual Behavior
When running any `az communication` command, the following warnings are printed:

```
.../azext_communication/aaz/latest/communication/_create.py:50: SyntaxWarning: invalid escape sequence '\w'
pattern="^[-\w]+$",
.../azext_communication/aaz/latest/communication/_delete.py:52: SyntaxWarning: invalid escape sequence '\w'
pattern="^[-\w]+$",
.../azext_communication/aaz/latest/communication/_link_notification_hub.py:50: SyntaxWarning: invalid escape sequence '\w'
pattern="^[-\w]+$",
```
(and similar warnings in _list_key.py, _regenerate_key.py, _show.py, etc.)

### Related command

az communication email domain sender-username create
az communication email list

### Errors

.../azext_communication/aaz/latest/communication/_create.py:50: SyntaxWarning: invalid escape sequence '\w'
pattern="^[-\w]+$",
.../azext_communication/aaz/latest/communication/_delete.py:52: SyntaxWarning: invalid escape sequence '\w'
pattern="^[-\w]+$",
.../azext_communication/aaz/latest/communication/_link_notification_hub.py:50: SyntaxWarning: invalid escape sequence '\w'
pattern="^[-\w]+$",

### Issue script & Debug output

N/A

### Expected behavior

No SyntaxWarnings

### Environment Summary

* **Azure CLI Core:** 2.80.0
* **Communication Extension:** 1.14.0
* **OS:** Windows 11

### Additional context

_No response_