Bump rubocop from 1.57.2 to 1.58.0 and fix offenses

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.57.2 to 1.58.0.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.57.2...v1.58.0)

---
updated-dependencies:
- dependency-name: rubocop
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

app/models/application_record.rb

@@ -12,7 +12,7 @@ class ApplicationRecord < ActiveRecord::Base
     # and except the `log` of TestrunMessages or the `output` of Testruns
     attribute_names.without('content', 'log', 'output').each do |name|
       if send(name.to_sym).respond_to?(:strip)
-        send("#{name}=".to_sym, send(name).strip)
+        send(:"#{name}=", send(name).strip)
       end
     end
   end
@@ -21,7 +21,7 @@ class ApplicationRecord < ActiveRecord::Base
     # remove null bytes from string attributes
     attribute_names.each do |name|
       if send(name.to_sym).respond_to?(:tr)
-        send("#{name}=".to_sym, send(name).tr("\0", ''))
+        send(:"#{name}=", send(name).tr("\0", ''))
       end
     end
   end

app/models/submission.rb

@@ -213,7 +213,7 @@ class Submission < ApplicationRecord
   private
 
   def build_files_hash(files, attribute)
-    files&.map(&attribute.to_proc)&.zip(files)&.to_h || {}
+    files&.map(&attribute.to_proc)&.zip(files).to_h
   end
 
   def prepared_runner
@@ -269,7 +269,7 @@ class Submission < ApplicationRecord
   def score_file(output, file, requesting_user)
     assessor = Assessor.new(execution_environment:)
     assessment = assessor.assess(output)
-    passed = ((assessment[:passed] == assessment[:count]) and (assessment[:score]).positive?)
+    passed = (assessment[:passed] == assessment[:count]) and (assessment[:score]).positive?
     testrun_output = passed ? nil : "status: #{output[:status]}\n stdout: #{output[:stdout]}\n stderr: #{output[:stderr]}"
     if testrun_output.present?
       execution_environment.error_templates.each do |template|