Fix Ruby version in CI workflows to match Gemfile

Update Ruby version from 3.4.6 to 3.4.3 in all CI workflow files
(js_test.yml, lint_test.yml, rspec_test.yml) to match the version
specified in the Gemfile and .ruby-version file.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: justin808

.github/workflows/js_test.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         node: [22.x]
-        ruby: [3.4.6]
+        ruby: [3.4.3]
 
     env:
       RAILS_ENV: test

.github/workflows/lint_test.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         node: [22.x]
-        ruby: [3.4.6]
+        ruby: [3.4.3]
 
     env:
       RAILS_ENV: test

.github/workflows/rspec_test.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         node: [22.x]
-        ruby: [3.4.6]
+        ruby: [3.4.3]
 
     services:
       postgres: