[sonic_py_common] replace yaml.load to yaml.safe_load (#14991)

Why I did it
replace yaml.load to yaml.safe_load because yaml.safe_load is more secure

Work item tracking
Microsoft ADO (number only): 15022050
How I did it
How to verify it
Verified in DUT 201911 which yaml version < 5.1

src/sonic-py-common/sonic_py_common/device_info.py

@@ -345,7 +345,7 @@ def get_sonic_version_info():
         if yaml.__version__ >= "5.1":
             sonic_ver_info = yaml.full_load(stream)
         else:
-            sonic_ver_info = yaml.load(stream)
+            sonic_ver_info = yaml.safe_load(stream)
 
     return sonic_ver_info