Build(deps): Bump bigdecimal from 3.1.5 to 3.1.6 (#25322)

Bumps [bigdecimal](https://github.com/ruby/bigdecimal) from 3.1.5 to 3.1.6.
- [Release notes](https://github.com/ruby/bigdecimal/releases)
- [Changelog](https://github.com/ruby/bigdecimal/blob/master/CHANGES.md)
- [Commits](https://github.com/ruby/bigdecimal/compare/v3.1.5...v3.1.6)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -88,7 +88,7 @@ GEM
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
       rouge (>= 1.0.0)
-    bigdecimal (3.1.5)
+    bigdecimal (3.1.6)
     binding_of_caller (1.0.0)
       debug_inspector (>= 0.0.1)
     bootsnap (1.17.1)