Remove unsafe_html linter rule

Author: solid-illiaaihistov

lib/analysis_options.yaml

@@ -272,7 +272,6 @@ linter:
     - unnecessary_this
     - unnecessary_to_list_in_spreads
     - unrelated_type_equality_checks
-    - unsafe_html
     - use_build_context_synchronously
     - use_colored_box
     - use_decorated_box