fix(spec): update IN array test to reflect single-param binding

bind() passes the whole array as one positional parameter ($2), not one
param per element. This is correct: "name IN $2" with $2 = ["Alice","Bob"]
is valid N1QL and produces a single prepared-statement shape regardless
of array length, which is the caching goal of this PR.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: pimpin

spec/relation_spec.rb

@@ -355,8 +355,8 @@ def self.active
         it "should parameterize array IN conditions" do
             relation = RelationModel.where(name: ["Alice", "Bob"])
             n1ql, params = relation.send(:to_n1ql_with_params)
-            expect(n1ql).to include("name IN [$2, $3]")
-            expect(params).to eq(["relation_model", "Alice", "Bob"])
+            expect(n1ql).to include("name IN $2")
+            expect(params).to eq(["relation_model", ["Alice", "Bob"]])
         end
     end