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: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile

@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 # These were previously included in Ruby, but will be removed as of Ruby 3.4
 gem 'base64', '~> 0.2.0'
-gem 'bigdecimal', '~> 3.1.8'
+gem 'bigdecimal', '~> 3.1.9'
 
 gem 'jekyll-multiple-languages-plugin',
     github: 'perlun/jekyll-multiple-languages-plugin',

Gemfile.lock

@@ -18,7 +18,7 @@ GEM
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
     base64 (0.2.0)
-    bigdecimal (3.1.8)
+    bigdecimal (3.1.9)
     colorator (1.1.0)
     concurrent-ruby (1.3.3)
     csv (3.3.0)
@@ -101,7 +101,7 @@ PLATFORMS
 
 DEPENDENCIES
   base64 (~> 0.2.0)
-  bigdecimal (~> 3.1.8)
+  bigdecimal (~> 3.1.9)
   ffi (< 1.17.0)
   jekyll (~> 3.10)
   jekyll-multiple-languages-plugin!