Merge pull request #2201 from ruby/dependabot/bundler/steep/bigdecimal-3.1.9

Bump bigdecimal from 3.1.8 to 3.1.9 in /steep

Author: soutaro

steep/Gemfile.lock

@@ -17,7 +17,7 @@ GEM
     ast (2.4.2)
     base64 (0.2.0)
     benchmark (0.4.0)
-    bigdecimal (3.1.8)
+    bigdecimal (3.1.9)
     concurrent-ruby (1.3.4)
     connection_pool (2.4.1)
     csv (3.3.2)