test: modify checkpackages scritps of python-connector

packaging/checkPackageRuning.py

@@ -24,7 +24,7 @@ import time
 out = subprocess.getoutput("pip3 show taospy|grep Version| awk -F ':' '{print $2}' ")
 print("taospy version %s "%out)
 if (out == "" ):
-    os.system("pip install git+https://github.com/taosdata/taos-connector-python.git")
+    os.system("pip3 install git+https://github.com/taosdata/taos-connector-python.git")
     print("install taos python connector")
 else:
     os.system("pip3 install --upgrade  taospy  ")