chore: bump up `requests` version to avoid license issue (#142)

closes https://github.com/apache/skywalking/issues/7282
diff --git a/setup.py b/setup.py
index a64d4d2..25101df 100644
--- a/setup.py
+++ b/setup.py
@@ -48,7 +48,7 @@
             "pytest",
         ],
         "http": [
-            "requests",
+            "requests>=2.26.0",
         ],
         "kafka": [
             "kafka",