fix(pacmak): use mapped Ruby release version in gemspec

Author: omarqureshi

packages/jsii-pacmak/lib/targets/ruby.ts

@@ -7,7 +7,9 @@ import { Generator, Legalese } from '../generator';
 import { Target, TargetOptions } from '../target';
 import { subprocess } from '../util';
 import { VERSION } from '../version';
-import { toRubyVersionRange } from './version-utils';
+import { toReleaseVersion, toRubyVersionRange } from './version-utils';
+
+import { TargetName } from './index';
 
 export class RubyTarget extends Target {
   protected readonly generator: RubyGenerator;
@@ -818,7 +820,7 @@ class RubyGenerator extends Generator {
     const gemspecContent = [
       `Gem::Specification.new do |s|`,
       `  s.name        = '${gemName}'`,
-      `  s.version     = '${assembly.version}'`,
+      `  s.version     = '${toReleaseVersion(assembly.version, TargetName.RUBY)}'`,
       `  s.summary     = 'Ruby bindings for ${assembly.name}'`,
       `  s.authors     = ['JSII Generator']`,
       `  s.files       = Dir["lib/**/*"]`,