Bump factory_bot_rails from 4.8.2 to 6.2.0

Note we're changing the parent strategy because its default value
changed in Factory Bot 5. We're keeping the old one so it's compatible
with our test suite.

We're also removing the rubocop rule for static attributes because in
factory bot 5 this syntax is invalid and will raise an error, so there's
no need for rubocop to remind us about it.

Bumps [factory_bot_rails](https://github.com/thoughtbot/factory_bot_rails) from 4.8.2 to 6.2.0.
- [Release notes](https://github.com/thoughtbot/factory_bot_rails/releases)
- [Changelog](https://github.com/thoughtbot/factory_bot_rails/blob/master/NEWS.md)
- [Commits](https://github.com/thoughtbot/factory_bot_rails/compare/v4.8.2...v6.2.0)

---
updated-dependencies:
- dependency-name: factory_bot_rails
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Gemfile.lock

@@ -230,11 +230,11 @@ GEM
       multi_json (>= 1.3)
       rake
     execjs (2.8.1)
-    factory_bot (4.8.2)
-      activesupport (>= 3.0.0)
-    factory_bot_rails (4.8.2)
-      factory_bot (~> 4.8.2)
-      railties (>= 3.0.0)
+    factory_bot (6.2.0)
+      activesupport (>= 5.0.0)
+    factory_bot_rails (6.2.0)
+      factory_bot (~> 6.2.0)
+      railties (>= 5.0.0)
     faker (1.8.7)
       i18n (>= 0.7)
     faraday (1.7.0)
@@ -733,7 +733,7 @@ DEPENDENCIES
   devise-security (~> 0.11.1)
   email_spec (~> 2.2.0)
   erb_lint (~> 0.0.37)
-  factory_bot_rails (~> 4.8.2)
+  factory_bot_rails (~> 6.2.0)
   faker (~> 1.8.7)
   font-awesome-sass (~> 5.15.1)
   foundation-rails (~> 6.6.2.0)