try overriding default govuk-frontend font weight

app/assets/stylesheets/main.scss

@@ -34,6 +34,11 @@ $path: '/static/images/';
 // Dependencies from GOV.UK Frontend, packaged to be specific to this application
 @import './govuk-frontend/all';
 
+// Custom overrides
+.govuk-link {
+    font-weight: bold;
+}
+
 // Specific to this application
 @import 'local/typography';
 @import 'grids';

tests/end_to_end/conftest.py

@@ -37,5 +37,4 @@ def check_axe_report(page):
         assert violation["impact"] in [
             "minor",
             "moderate",
-            "serious",
         ], f"Accessibility violation: {violation}"