Release v4.0.0

## 4.0.0

### Breaking
- BREAKING: drop support for end-of-life Ruby versions 2.7 and 3.0. The minimum Ruby version is now 3.1.
- BREAKING: drop support for IE8
- Upgrade to govuk-frontend v5.7.1 and introduce new Javascript entry point

To upgrade you need to:
  - create a `govuk_frontend.js` file your project’s `source/assets/javascripts` directory
  - add `//= require govuk_frontend_all` into it

### Fixes

- Update gem dependencies.
- Declare some missing indirect dependencies to prepare for Ruby 3.4. This also resolves some warnings about this at build time.
- Remove aria-hidden from search label to let assistive technologies see its accessible name
- Use hidden attribute to show/hide expiry notices instead of just CSS
- Only use dialog role for table of contents when it behaves like one (accessibility fix)
- Prevent interactive elements being obscured by sticky table of contents header
- Only wrap images with alt text in hyperlinks

CHANGELOG.md

@@ -1,14 +1,18 @@
-# Changelog
-
 ## Unreleased
+
+## 4.0.0
+
+### Breaking
+- BREAKING: drop support for end-of-life Ruby versions 2.7 and 3.0. The minimum Ruby version is now 3.1.
+- BREAKING: drop support for IE8
 - Upgrade to govuk-frontend v5.7.1 and introduce new Javascript entry point
-  BREAKING: drop support for IE8
 
-You need to
+To upgrade you need to:
   - create a `govuk_frontend.js` file your project’s `source/assets/javascripts` directory
   - add `//= require govuk_frontend_all` into it
 
-- BREAKING: drop support for end-of-life Ruby versions 2.7 and 3.0. The minimum Ruby version is now 3.1.
+### Fixes
+
 - Update gem dependencies.
 - Declare some missing indirect dependencies to prepare for Ruby 3.4. This also resolves some warnings about this at build time.
 - Remove aria-hidden from search label to let assistive technologies see its accessible name

lib/govuk_tech_docs/version.rb

@@ -1,3 +1,3 @@
 module GovukTechDocs
-  VERSION = "3.5.0".freeze
+  VERSION = "4.0.0".freeze
 end