Bump defra_ruby_alert from 2.1.1 to 2.2.1 (#1354)

Bumps [defra_ruby_alert](https://github.com/DEFRA/defra-ruby-alert) from 2.1.1 to 2.2.1.
- [Release notes](https://github.com/DEFRA/defra-ruby-alert/releases)
- [Changelog](https://github.com/DEFRA/defra-ruby-alert/blob/main/CHANGELOG.md)
- [Commits](DEFRA/defra-ruby-alert@v2.1.1...v2.2.1)

---
updated-dependencies:
- dependency-name: defra_ruby_alert
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -86,10 +86,10 @@ GEM
       zeitwerk (~> 2.3)
     addressable (2.8.1)
       public_suffix (>= 2.0.2, < 6.0)
-    airbrake (12.0.0)
+    airbrake (13.0.3)
       airbrake-ruby (~> 6.0)
-    airbrake-ruby (6.0.2)
-      rbtree3 (~> 0.5)
+    airbrake-ruby (6.2.1)
+      rbtree3 (~> 0.6)
     ast (2.4.2)
     async (1.30.1)
       console (~> 1.10)
@@ -131,7 +131,7 @@ GEM
     date (3.3.3)
     defra_ruby_address (0.1.0)
       rest-client (~> 2.0)
-    defra_ruby_alert (2.1.1)
+    defra_ruby_alert (2.2.1)
       airbrake
     defra_ruby_email (1.2.0)
       notifications-ruby-client
@@ -323,7 +323,7 @@ GEM
       thor (~> 1.0)
     rainbow (3.1.1)
     rake (13.0.6)
-    rbtree3 (0.7.0)
+    rbtree3 (0.7.1)
     regexp_parser (2.7.0)
     responders (3.1.0)
       actionpack (>= 5.2)