Upgrade Ruby to 4.0.9 and refresh dependencies

.github/workflows/lint.yml

@@ -9,6 +9,6 @@ jobs:
       - uses: actions/checkout@v6
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "4.0.2"
+          ruby-version: "4.0.9"
           bundler-cache: true
       - run: bundle exec rubocop

.github/workflows/test.yml

@@ -9,16 +9,16 @@ jobs:
       - uses: actions/checkout@v6
       - uses: browser-actions/setup-firefox@v1
         with:
-          firefox-version: '143.0.3'
+          firefox-version: '157.0'
       - uses: browser-actions/setup-geckodriver@latest
         with:
-          geckodriver-version: "0.36.0"
+          geckodriver-version: "0.37.1"
       - uses: supercharge/mongodb-github-action@v1
         with:
           mongodb-version: "8.0"
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "4.0.2"
+          ruby-version: "4.0.9"
           bundler-cache: true
       - uses: GabrielBB/xvfb-action@v1
         with:

.rubocop_todo.yml

@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2026-05-18 22:08:00 UTC using RuboCop version 1.86.2.
+# on 2026-10-23 17:16:52 UTC using RuboCop version 1.92.1.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -75,7 +75,7 @@ RSpec/ContextWording:
 # Offense count: 9
 # Configuration parameters: CountAsOne.
 RSpec/ExampleLength:
-  Max: 38
+  Max: 11
 
 # Offense count: 1
 # Configuration parameters: AssignmentOnly.
@@ -96,7 +96,7 @@ RSpec/MessageSpies:
 
 # Offense count: 21
 RSpec/MultipleExpectations:
-  Max: 10
+  Max: 6
 
 # Offense count: 1
 # Configuration parameters: AllowSubject.

CHANGELOG.md

@@ -1,5 +1,6 @@
 ### Changelog
 
+* 2026/10/23: Upgrade to Ruby 4.0.9 and refresh dependencies and CI browser tooling - [@dblock](https://github.com/dblock), [@Copilot](https://github.com/apps/copilot-swe-agent).
 * 2025/09/29: Upgraded to Ruby 3.4.6 - [@dblock](https://github.com/dblock).
 * 2020/11/22. [#22](https://github.com/slack-ruby/slack-shellbot/pull/22): Migrate app to granular scopes and events API - [@dblock](https://github.com/dblock).
 * 2018/9/10, [#6](https://github.com/slack-ruby/slack-shellbot/issues/6): Fix `Unmatched double quote` errors - [@dblock](https://github.com/dblock).

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-ruby '4.0.2'
+ruby '4.0.9'
 
 gem 'irb'
 gem 'kaminari-grape'