test: use Lakehouse port 15000 in Altertable.init

Author: Albert

spec/altertable_spec.rb

@@ -7,7 +7,7 @@
   let(:base_url) { "http://127.0.0.1:15000" }
 
   before do
-    Altertable.init(api_key, base_url: 'http://127.0.0.1:15001')
+    Altertable.init(api_key, base_url: 'http://127.0.0.1:15000')
   end
 
   it "has a version number" do