Build(deps): Update json_pure requirement from >= 2.6.3, < 2.8.0 to >…

…= 2.6.3, < 2.9.0

Updates the requirements on [json_pure](https://github.com/ruby/json) to permit the latest version.
- [Release notes](https://github.com/ruby/json/releases)
- [Changelog](https://github.com/ruby/json/blob/master/CHANGES.md)
- [Commits](https://github.com/ruby/json/commits)

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

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

Gemfile.lock

@@ -4,7 +4,7 @@ PATH
     tetra (2.0.6)
       clamp (~> 1.3.2)
       erb (~> 4.0.3)
-      json_pure (>= 2.6.3, < 2.8.0)
+      json_pure (>= 2.6.3, < 2.9.0)
       open4 (~> 1.3.4)
       rexml (>= 3.2.9, < 3.4.0)
       rubyzip (~> 2.3.2)
@@ -54,7 +54,7 @@ GEM
       cgi (>= 0.3.3)
     ffi (1.16.3)
     json (2.7.5)
-    json_pure (2.7.5)
+    json_pure (2.8.1)
     language_server-protocol (3.17.0.3)
     mini_mime (1.1.5)
     multi_test (1.1.0)

tetra.gemspec

@@ -34,7 +34,7 @@ Gem::Specification.new do |s|
 
   s.add_runtime_dependency "clamp", "~> 1.3.2"
   s.add_runtime_dependency "erb", "~> 4.0.3"
-  s.add_runtime_dependency "json_pure", ">= 2.6.3", "< 2.8.0"
+  s.add_runtime_dependency "json_pure", ">= 2.6.3", "< 2.9.0"
   s.add_runtime_dependency "open4", "~> 1.3.4"
   s.add_runtime_dependency "rexml", ">= 3.2.9", "< 3.4.0"
   s.add_runtime_dependency "rubyzip", "~> 2.3.2"