chore: update lxml dependency to version 6.0.0 in base requirements

Author: pablohashescobar

apps/api/requirements/base.txt

@@ -53,7 +53,7 @@ posthog==3.5.0
 # crypto
 cryptography==44.0.1
 # html validator
-lxml==5.2.1
+lxml==6.0.0
 # s3
 boto3==1.34.96
 # password validator