Update config.sh

Change IDF branch to release/v5.1

Author: lisir233

tools/config.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-export IDF_COMMIT="2600eea"
-export IDF_BRANCH="feature/increase-ALARM_CBS_NUM"
+export IDF_COMMIT="d922d41"   //2600eea
+export IDF_BRANCH="release/v5.1"  //feature/increase-ALARM_CBS_NUM
 
 if [ -z $IDF_PATH ]; then
     export IDF_PATH="$PWD/esp-idf"