[ruby/bigdecimal] Bump up to 3.1.5
https://github.com/ruby/bigdecimal/commit/c47802e813
[ruby/bigdecimal] Bump up to 3.1.5
https://github.com/ruby/bigdecimal/commit/c47802e813