Fix incorrect pessismistic versioning requirement.

Index: .metadata
--- .metadata.orig
+++ .metadata
@@ -16,14 +16,14 @@ dependencies:
   name: bigdecimal
   requirement: !ruby/object:Gem::Requirement
     requirements:
-    - - "~>"
+    - - ">"
       - !ruby/object:Gem::Version
         version: '3'
   type: :runtime
   prerelease: false
   version_requirements: !ruby/object:Gem::Requirement
     requirements:
-    - - "~>"
+    - - ">"
       - !ruby/object:Gem::Version
         version: '3'
 - !ruby/object:Gem::Dependency
