Remove http:// from test URL because Net::HTTP expects a host

spec/acceptance/net_http/net_http_spec.rb

@@ -215,14 +215,14 @@ class TestMarshalingInWebMockNetHTTP
 
   if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new('2.7.0')
     it "uses the StubSocket to provide IP address" do
-      Net::HTTP.start("http://example.com") do |http|
+      Net::HTTP.start("example.com") do |http|
         expect(http.ipaddr).to eq("127.0.0.1")
       end
     end
   end
 
   it "defines common socket methods" do
-    Net::HTTP.start("http://example.com") do |http|
+    Net::HTTP.start("example.com") do |http|
       socket = http.instance_variable_get(:@socket)
       expect(socket.io.ssl_version).to eq("TLSv1.3")
       expect(socket.io.cipher).to eq(["TLS_AES_128_GCM_SHA256", "TLSv1.3", 128, 128])