Bump async from 2.11.0 to 2.12.0

Bumps [async](https://github.com/socketry/async) from 2.11.0 to 2.12.0.
- [Release notes](https://github.com/socketry/async/releases)
- [Changelog](https://github.com/socketry/async/blob/main/release.cert)
- [Commits](socketry/async@v2.11.0...v2.12.0)

---
updated-dependencies:
- dependency-name: async
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -17,11 +17,10 @@ GEM
     addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
     afm (0.2.2)
-    async (2.11.0)
+    async (2.12.0)
       console (~> 1.25, >= 1.25.2)
       fiber-annotation
-      io-event (~> 1.5, >= 1.5.1)
-      timers (~> 4.1)
+      io-event (~> 1.6)
     autoprefixer-rails (10.4.16.0)
       execjs (~> 2)
     aws-eventstream (1.3.0)
@@ -96,7 +95,7 @@ GEM
     http_parser.rb (0.8.0)
     i18n (1.6.0)
       concurrent-ruby (~> 1.0)
-    io-event (1.5.1)
+    io-event (1.6.0)
     jmespath (1.6.2)
     json (2.7.2)
     kramdown (2.4.0)
@@ -215,7 +214,6 @@ GEM
     temple (0.10.3)
     thor (1.2.2)
     tilt (2.0.11)
-    timers (4.3.5)
     toml (0.3.0)
       parslet (>= 1.8.0, < 3.0.0)
     ttfunk (1.8.0)