Remove obsolete JSON version pin from test bundle

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: dblock

AGENTS.md

@@ -10,4 +10,3 @@ Read [CONTRIBUTING.md](CONTRIBUTING.md) first for setup, tests, lint, changelog,
 - Do not edit the API-reference submodule or include existing submodule changes unless requested.
 - The API update task pulls the latest reference and can generate unrelated changes. Verify the patch against both the latest and pinned reference; keep unrelated generated updates out of a focused PR. Custom endpoint specs are handwritten despite their location under `endpoints/`.
 - Do not suppress environment warnings in application code or tests. Report local validation limitations explicitly; CLI specs compare subprocess output and can fail when Bundler emits unrelated warnings.
-- Keep the test bundle on JSON below 3 until Faraday's JSON middleware supports JSON 3's keyword-only parse options.

CHANGELOG.md

@@ -1,5 +1,6 @@
 ### 3.3.0 (Next)
 
+* Remove the test-bundle JSON version pin; Faraday 2.14.4 supports JSON 3 - [@dblock](https://github.com/dblock).
 * [#603](https://github.com/slack-ruby/slack-ruby-client/pull/603): Enforce consistent exception messages with rubocop-exception_messages and run lint separately from the test matrix - [@dblock](https://github.com/dblock).
 * [#602](https://github.com/slack-ruby/slack-ruby-client/pull/602): Make gli an optional dependency; only the `slack` command-line client needs it - [@corsonknowles](https://github.com/corsonknowles).
 * [#599](https://github.com/slack-ruby/slack-ruby-client/pull/599): Set a default filename in `files_upload` so Slack displays image previews correctly when none is specified - [@ts-3156](https://github.com/ts-3156), [@dblock](https://github.com/dblock).

Gemfile

@@ -13,7 +13,6 @@ group :test do
   gem 'erubis'
   gem 'faraday-typhoeus'
   gem 'gli'
-  gem 'json', '< 3' # Faraday's JSON middleware passes options as a positional hash.
   gem 'json-schema'
   gem 'mutex_m'
   gem 'racc'