chore: temporary point at new tools branch

Author: durran

.evergreen/prepare-shell.sh

@@ -11,7 +11,7 @@ export DRIVERS_TOOLS
 
 if [ ! -d "$DRIVERS_TOOLS" ]; then
   # Only clone driver tools if it does not exist
-  git clone --depth=1 "https://github.com/mongodb-labs/drivers-evergreen-tools.git" "${DRIVERS_TOOLS}"
+  git clone --depth=1 --branch NODE-6636 "https://github.com/mongodb-labs/drivers-evergreen-tools.git" "${DRIVERS_TOOLS}"
 fi
 
 echo "installed DRIVERS_TOOLS from commit $(git -C "${DRIVERS_TOOLS}" rev-parse HEAD)"