Migrate to fontawesome 6

app/views/surveys/_list.html.haml

@@ -1,7 +1,7 @@
 - surveys.each do |survey|
   - if survey.survey_submissions.find_by(user: current_user)
-    %i.fa.fa-check-square-o.text-success{ title: 'Thank you for filling out the survey' }
+    %i.fa-solid.fa-square-check.text-success{ title: 'Thank you for filling out the survey' }
   - else
-    %i.fa.fa-minus-square-o.text-danger{ title: 'Please fill out the survey' }
+    %i.fa-solid.fa-square-minus.text-danger{ title: 'Please fill out the survey' }
   = link_to survey.title, conference_survey_path(conference.short_title, survey)
   %br

app/views/surveys/show.html.haml

@@ -12,7 +12,7 @@
         = @survey.end_date
         - unless @survey.active?
           %label
-            %i.fa.fa-exclamation-circle
+            %i.fa-solid.fa-circle-exclamation
             This survey does not accept replies at this monent.
 .row
   .col-md-12