Bump stringio from 3.0.9 to 3.1.0 in /src

Bumps [stringio](https://github.com/ruby/stringio) from 3.0.9 to 3.1.0.
- [Release notes](https://github.com/ruby/stringio/releases)
- [Changelog](https://github.com/ruby/stringio/blob/master/NEWS.md)
- [Commits](ruby/stringio@v3.0.9...v3.1.0)

---
updated-dependencies:
- dependency-name: stringio
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

src/Gemfile.lock

@@ -226,7 +226,7 @@ GEM
     sqlite3 (1.6.8-x86_64-linux)
     stimulus-rails (1.3.0)
       railties (>= 6.0.0)
-    stringio (3.0.9)
+    stringio (3.1.0)
     tailwindcss-rails (2.0.32-aarch64-linux)
       railties (>= 6.0.0)
     tailwindcss-rails (2.0.32-arm64-darwin)