build(deps): bump webrick in /assets/loggregator-load-generator (#1759)

Bumps [webrick](https://github.com/ruby/webrick) from 1.9.1 to 1.9.2.
- [Release notes](https://github.com/ruby/webrick/releases)
- [Commits](ruby/webrick@v1.9.1...v1.9.2)

---
updated-dependencies:
- dependency-name: webrick
  dependency-version: 1.9.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

assets/loggregator-load-generator/Gemfile.lock

@@ -24,7 +24,7 @@ GEM
       rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
     tilt (2.6.1)
-    webrick (1.9.1)
+    webrick (1.9.2)
 
 PLATFORMS
   ruby