Bump stringio from 3.1.1 to 3.1.2

Bumps [stringio](https://github.com/ruby/stringio) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/ruby/stringio/releases)
- [Changelog](https://github.com/ruby/stringio/blob/master/NEWS.md)
- [Commits](ruby/stringio@v3.1.1...v3.1.2)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -489,7 +489,7 @@ GEM
     stimulus-rails (1.3.4)
       railties (>= 6.0.0)
     stringex (2.8.6)
-    stringio (3.1.1)
+    stringio (3.1.2)
     stripe (8.7.0)
     thor (1.3.2)
     tilt (2.4.0)