Bump rdoc from 6.6.2 to 6.6.3.1 in /pricing_catalog_rails_app

Bumps [rdoc](https://github.com/ruby/rdoc) from 6.6.2 to 6.6.3.1.
- [Release notes](https://github.com/ruby/rdoc/releases)
- [Changelog](https://github.com/ruby/rdoc/blob/master/History.rdoc)
- [Commits](ruby/rdoc@v6.6.2...v6.6.3.1)

---
updated-dependencies:
- dependency-name: rdoc
  dependency-type: indirect
...

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

pricing_catalog_rails_app/Gemfile.lock

@@ -242,7 +242,7 @@ GEM
       thor (~> 1.0, >= 1.2.2)
       zeitwerk (~> 2.6)
     rake (13.1.0)
-    rdoc (6.6.2)
+    rdoc (6.6.3.1)
       psych (>= 4.0.0)
     redis (5.0.8)
       redis-client (>= 0.17.0)
@@ -278,7 +278,7 @@ GEM
     sqlite3 (1.7.1-x86_64-linux)
     stimulus-rails (1.3.3)
       railties (>= 6.0.0)
-    stringio (3.1.0)
+    stringio (3.1.1)
     thor (1.3.0)
     timeout (0.4.1)
     turbo-rails (1.5.0)