FIX: Fix databento-python build.sh

Author: threecgreen

scripts/build.sh

@@ -1,6 +1,5 @@
 #! /usr/bin/env bash
 set -e
-python -m pip install --upgrade pip setuptools wheel
-pip install -r requirements.txt
-pip install -r requirements_dev.txt
-pip install .
+pip3 install -r requirements.txt
+pip3 install -r requirements_dev.txt
+pip3 install .