chore: update all bash scripts to use shebang: /usr/bin/env bash (#128)

Author: ryannikolaidis

scripts/docker-build.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -euo pipefail
 

scripts/shellcheck.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 find scripts -name "*.sh" -exec shellcheck {} +
 

scripts/version-sync.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 function usage {
     echo "Usage: $(basename "$0") [-c] -f FILE_TO_CHANGE REPLACEMENT_FORMAT [-f FILE_TO_CHANGE REPLACEMENT_FORMAT ...]" 2>&1
     echo 'Synchronize files to latest version in source file'