* Bump maintenance branches to 3.2.9 (#1079)

Ruby 3.2.9 has been released:
https://www.ruby-lang.org/en/news/2025/07/24/ruby-3-2-9-released/

Bump 3.2 branch from 3.2.8 to 3.2.9:
ruby/ruby@v3_2_8...v3_2_9

There seems to be no change to syntax.

Author: koic

.github/workflows/test.yml

@@ -17,14 +17,14 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.1.7", "3.2.8", "3.3.8", "3.4.1", "jruby-9.4"]
+        ruby: ["3.1.7", "3.2.9", "3.3.8", "3.4.1", "jruby-9.4"]
         test_command: ["bundle exec rake test"]
         include:
           - ruby: "head"
             test_command: "bundle exec rake test || true"
           - ruby: "truffleruby"
             test_command: "bundle exec rake test || true"
-          - ruby: "3.2.8"
+          - ruby: "3.2.9"
             test_command: "./ci/run_rubocop_specs || true"
           - ruby: "3.3.8"
             test_command: "./ci/run_rubocop_specs || true"

lib/parser/current.rb

@@ -102,7 +102,7 @@ def warn_syntax_deviation(feature, version)
     CurrentRuby = Ruby31
 
   when /^3\.2\./
-    current_version = '3.2.8'
+    current_version = '3.2.9'
     if RUBY_VERSION != current_version
       warn_syntax_deviation 'parser/ruby32', current_version
     end