Merge pull request #12242 from smlng/tools_shebang

tools: fix shebang in scripts

dist/tools/has_minimal_version/has_minimal_version.sh

@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 #
 # usage: has_minimal_version.sh <version> <minimal_version> [toolname]
 #   Checks that version >= minimal_version

dist/tools/openocd/openocd.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Unified OpenOCD script for RIOT
 #

dist/tools/packer/setup.sh

@@ -1,4 +1,4 @@
-#!/bin/bash -eux
+#!/usr/bin/env bash -eux
 
 # inspired by https://github.com/boxcutter/ubuntu