Bump bigdecimal from 3.1.7 to 3.1.8

Bumps [bigdecimal](https://github.com/ruby/bigdecimal) from 3.1.7 to 3.1.8.
- [Release notes](https://github.com/ruby/bigdecimal/releases)
- [Changelog](https://github.com/ruby/bigdecimal/blob/master/CHANGES.md)
- [Commits](ruby/bigdecimal@v3.1.7...v3.1.8)

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

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

Gemfile.lock

@@ -171,7 +171,7 @@ GEM
     base64 (0.2.0)
     bcrypt (3.1.20)
     bcrypt_pbkdf (1.1.0)
-    bigdecimal (3.1.7)
+    bigdecimal (3.1.8)
     bindex (0.8.1)
     bootsnap (1.18.3)
       msgpack (~> 1.2)