fix: change httpbin.org from http to https

examples/httpbin/validate.yml

@@ -1,6 +1,6 @@
 config:
     name: basic test with httpbin
-    base_url: http://httpbin.org/
+    base_url: https://httpbin.org/
 
 teststeps:
 -

examples/httpbin/validate_test.py

@@ -5,7 +5,7 @@ from httprunner import HttpRunner, Config, Step, RunRequest
 
 class TestCaseValidate(HttpRunner):
 
-    config = Config("basic test with httpbin").base_url("http://httpbin.org/")
+    config = Config("basic test with httpbin").base_url("https://httpbin.org/")
 
     teststeps = [
         Step(