Bump rubocop-capybara from 2.19.0 to 2.20.0

Note that this version changed the default enforced styles for
ClickLinkOrButtonStyle and NegationMatcher, so we're now specifying
them.

Bumps [rubocop-capybara](https://github.com/rubocop/rubocop-capybara) from 2.19.0 to 2.20.0.
- [Release notes](https://github.com/rubocop/rubocop-capybara/releases)
- [Changelog](https://github.com/rubocop/rubocop-capybara/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop-capybara/compare/v2.19.0...v2.20.0)

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

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

.rubocop.yml

@@ -22,12 +22,14 @@ Bundler/OrderedGems:
 
 Capybara/ClickLinkOrButtonStyle:
   Enabled: true
+  EnforcedStyle: strict
 
 Capybara/CurrentPathExpectation:
   Enabled: true
 
 Capybara/NegationMatcher:
   Enabled: true
+  EnforcedStyle: not_to
 
 Capybara/RSpec/HaveSelector:
   Enabled: true