chore: upgrade websocket-driver (#14961)

# Pull Request Template

## Description

Updates `websocket-driver` from `0.7.7` to `0.8.2` to resolve the
bundle-audit findings for CVE-2026-54463, CVE-2026-54464,
CVE-2026-54465, and GHSA-2x63-gw47-w4mm.

This is a lockfile-only transitive dependency update through Rails
Action Cable. No application code changes are included.

Fixes # (issue)
N/A

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)

## How Has This Been Tested?

- `bundle exec bundle audit update && bundle exec bundle audit check -v`
- `bundle check && bundle exec ruby -e 'require "action_cable"; require
"action_cable/connection/client_socket"; require "websocket/driver";
puts "actioncable=#{ActionCable::VERSION::STRING}"; puts
"websocket-driver=#{Gem.loaded_specs["websocket-driver"].version}"; puts
"driver_rack=#{WebSocket::Driver.respond_to?(:rack)}"'`
- `POSTGRES_DATABASE=chatwoot_test_3d6a RAILS_ENV=test bundle exec rails
db:prepare && POSTGRES_DATABASE=chatwoot_test_3d6a bundle exec rspec
spec/listeners/action_cable_listener_spec.rb`
- `git diff --check`

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas (not applicable; lockfile-only change)
- [ ] I have made corresponding changes to the documentation (not
applicable; dependency security update)
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works (not applicable; dependency security update)
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules (not applicable)

Gemfile.lock

@@ -1030,7 +1030,7 @@ GEM
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
-    websocket-driver (0.7.7)
+    websocket-driver (0.8.2)
       base64
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)