Update Bundler to avoid permission error on GHA

The following error happens in GHA and updating Bundler will solve it. ``` The installation path is insecure. Bundler cannot continue. ```
ruby · Jan 31, 2025 · 88aa628 · 88aa628
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commit 88aa628
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diff --git a/Gemfile.lock b/Gemfile.lock
@@ -196,4 +196,4 @@ DEPENDENCIES
   test-unit
 
 BUNDLED WITH
-   2.5.16
+   2.6.3
diff --git a/steep/Gemfile.lock b/steep/Gemfile.lock
@@ -76,4 +76,4 @@ DEPENDENCIES
   steep (~> 1.9.2)
 
 BUNDLED WITH
-   2.5.16
+   2.6.3
-Original file line number
+Diff line change
@@ Expand Up / @@ -196,4 +196,4 @@ DEPENDENCIES @@
       test-unit
     BUNDLED WITH
-.5.16
+.6.3