regex warnings in MsftLinuxPatchCore.py?

**Describe the bug**
I see the following in my journalctl logs:

```
Aug 22 00:36:41 sr-monitor systemd[1]: Starting MsftLinuxPatchAutoAssess.service - Microsoft Azure Linux Patch Extension - Auto Assessment...
Aug 22 00:36:41 sr-monitor bash[143561]: /var/lib/waagent/Microsoft.CPlat.Core.LinuxPatchExtension-1.6.62/MsftLinuxPatchCore.py:7451: SyntaxWarning: invalid escape sequence '\_'
Aug 22 00:36:41 sr-monitor bash[143561]: """ Fetches pid from the error message by searching for the text 'pid' and returns the process tree with all details.
Aug 22 00:36:41 sr-monitor bash[143561]: /var/lib/waagent/Microsoft.CPlat.Core.LinuxPatchExtension-1.6.62/MsftLinuxPatchCore.py:7468: SyntaxWarning: invalid escape sequence '\d'
Aug 22 00:36:41 sr-monitor bash[143561]: regex = re.compile(' pid \d+')
Aug 22 00:36:41 sr-monitor bash[143561]: /var/lib/waagent/Microsoft.CPlat.Core.LinuxPatchExtension-1.6.62/MsftLinuxPatchCore.py:7476: SyntaxWarning: invalid escape sequence '\d'
Aug 22 00:36:41 sr-monitor bash[143561]: regex = re.compile('\d+')
```

Is this a bug?

**To Reproduce**
Steps to reproduce the behavior:
1. Create Azure Ubuntu VM
2. Enable LinuxPatchExtension
3. Watch the logs

**Expected behavior**
No regex warnings

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Desktop (please complete the following information):**
- OS: ubuntu
- Browser N/A
- Version 24_04-lts

**Smartphone (please complete the following information):**
- Device: [e.g. iPhone6]
- OS: [e.g. iOS8.1]
- Browser [e.g. stock browser, safari]
- Version [e.g. 22]

**Additional context**
Add any other context about the problem here.

Commencez dans MsftLinuxPatchCore.py aux lignes 7451, 7468 et 7476, puis reproduisez le problème sur une VM Azure Ubuntu 24.04 tout en surveillant les journaux de l’extension. Vérifiez que le traitement de l’expression régulière concernée n’émet plus d’avertissements concernant des séquences d’échappement invalides lors du démarrage de LinuxPatchExtension.

Rédigé par le modèle d'indexation à partir du texte de l'issue.