chore(deps): update beautifulsoup4 requirement from ~=4.9.3 to ~=4.13.4 in /backend (#189)

Updates the requirements on
[beautifulsoup4](https://www.crummy.com/software/BeautifulSoup/bs4/) to
permit the latest version.


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backend/requirements.txt

@@ -12,7 +12,7 @@ lizard~=1.17.10
 factory-boy~=3.3.3
 django-filter~=25.1
 requests~=2.32.3
-beautifulsoup4~=4.9.3
+beautifulsoup4~=4.13.4
 django-cors-headers~=4.7.0
 djangorestframework-api-key~=3.0.0
 channels==4.1.0