Bump bigdecimal from 3.1.8 to 3.1.9

Bumps [bigdecimal](https://github.com/ruby/bigdecimal) from 3.1.8 to 3.1.9.
- [Release notes](https://github.com/ruby/bigdecimal/releases)
- [Changelog](https://github.com/ruby/bigdecimal/blob/master/CHANGES.md)
- [Commits](ruby/bigdecimal@v3.1.8...v3.1.9)

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

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

Gemfile.lock

@@ -40,7 +40,7 @@ GEM
     aws-sigv4 (1.10.1)
       aws-eventstream (~> 1, >= 1.0.2)
     backports (3.25.0)
-    bigdecimal (3.1.8)
+    bigdecimal (3.1.9)
     coffee-script (2.4.1)
       coffee-script-source
       execjs