chore(deps): bump bigdecimal from 3.3.1 to 4.0.0 in /example

Bumps [bigdecimal](https://github.com/ruby/bigdecimal) from 3.3.1 to 4.0.0.
- [Release notes](https://github.com/ruby/bigdecimal/releases)
- [Changelog](https://github.com/ruby/bigdecimal/blob/master/CHANGES.md)
- [Commits](ruby/bigdecimal@v3.3.1...v4.0.0)

---
updated-dependencies:
- dependency-name: bigdecimal
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

example/Gemfile.lock

@@ -25,7 +25,7 @@ GEM
     atomos (0.1.3)
     base64 (0.3.0)
     benchmark (0.5.0)
-    bigdecimal (3.3.1)
+    bigdecimal (4.0.0)
     claide (1.1.0)
     cocoapods (1.15.2)
       addressable (~> 2.8)