fix: restore Gemfile.lock with listen gem for CI compatibility

Ruby 4.0 skips listen gem installation, but CI runs on Ruby 3.x which
requires it. Restore the original Gemfile.lock from main branch.

Author: yhk1038

Gemfile.lock

@@ -11,9 +11,14 @@ GEM
     benchmark (0.5.0)
     diff-lcs (1.6.2)
     docile (1.4.1)
+    ffi (1.17.2)
+    ffi (1.17.2-x86_64-linux-gnu)
     json (2.17.1)
     language_server-protocol (3.17.0.5)
     lint_roller (1.1.0)
+    listen (3.9.0)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
     logger (1.7.0)
     parallel (1.27.0)
     parser (3.3.10.0)
@@ -23,6 +28,9 @@ GEM
     racc (1.8.1)
     rainbow (3.1.1)
     rake (13.3.1)
+    rb-fsevent (0.11.2)
+    rb-inotify (0.11.1)
+      ffi (~> 1.0)
     rbs (3.10.0)
       logger
     regexp_parser (2.11.3)
@@ -65,13 +73,14 @@ GEM
     simplecov_json_formatter (0.1.4)
     unicode-display_width (3.2.0)
       unicode-emoji (~> 4.1)
-    unicode-emoji (4.2.0)
+    unicode-emoji (4.1.0)
 
 PLATFORMS
   ruby
   x86_64-linux
 
 DEPENDENCIES
+  listen (~> 3.8)
   rake (~> 13.0)
   rbs (~> 3.0)
   rspec (~> 3.0)