use bash instead

Author: blink1073

.evergreen/scripts/setup-dev-env.sh

@@ -17,7 +17,7 @@ else
   BIN_DIR=.venv/bin
 fi
 
-. $HERE/install-dependencies.sh
+bash $HERE/install-dependencies.sh
 
 # Ensure there is a python venv.
 if [ ! -d $BIN_DIR ]; then