Apply Layout/LineLength rubocop rule

Note we're excluding a few files:

* Configuration files that weren't generated by us
* Migration files that weren't generated by us
* The Gemfile, since it includes an important comment that must be on
  the same line as the gem declaration
* The Budget::Stats class, since the heading statistics are a mess and
  having shorter lines would require a lot of refactoring

app/components/budgets/investments/votes_component.rb

@@ -64,7 +64,10 @@ class Budgets::Investments::VotesComponent < ApplicationComponent
         t("votes.budget_investments.#{reason}",
           count: investment.group.max_votable_headings,
           verify_account: link_to_verify_account,
-          supported_headings: (current_user && current_user.headings_voted_within_group(investment.group).map(&:name).sort.to_sentence))
+          supported_headings: (current_user && current_user.headings_voted_within_group(investment.group)
+                                                           .map(&:name)
+                                                           .sort
+                                                           .to_sentence))
       end
     end
 end