fix:use dedicate environment python3.9 instead of python3.8

Jenkinsfile2

@@ -407,7 +407,7 @@ pipeline {
                     }
                 }
                 stage('linux test') {
-                    agent{label " slave1_47 || slave1_48 || slave1_49 || slave1_52 || worker03 || slave215 || slave217 || slave219 "}
+                    agent{label " slave219 "}
                     options { skipDefaultCheckout() } 
                     when {
                         changeRequest()

tests/parallel_test/run_case.sh

@@ -81,7 +81,12 @@ pip3 list|grep taospy
 pip3 uninstall taospy -y
 pip3 install taospy==2.7.6
 
+apt install -y python3 python3-dev python3-venv
+/usr/bin/python3 -m venv /udfenv
+source /udfenv/bin/activate
 pip3 install taospyudf
+ldconfig
+deactivate
 
 $TIMEOUT_CMD $cmd
 RET=$?