Update draft changelog script shebang (#2450)

Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>

Author: breedx-splk

.github/scripts/draft-change-log-entries.sh

@@ -1,4 +1,6 @@
-#!/bin/bash -e
+#!/usr/bin/env bash
+
+set -e
 
 version=$("$(dirname "$0")/get-version.sh")