Make shell scripts more portable by using /usr/bin/env bash

qa/pull-tester/cc-tests.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e -o pipefail
 
 CURDIR=$(cd $(dirname "$0"); pwd)

qa/pull-tester/rpc-tests.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Copyright (c) 2016-2022 The Hush developers
 # Released under the GPLv3
 

qa/pull-tester/run-bitcoin-cli

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Copyright (c) 2016-2022 The Hush developers
 # Released under the GPLv3
 

qa/pull-tester/run-bitcoind-for-test.sh.in

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # THIS FILE IS GENERATED FROM run-bitcoind-for-test.sh.in
 # Copyright (c) 2013-2014 The Bitcoin Core developers
 # Copyright (c) 2016-2022 The Hush developers

qa/pull-tester/tests-config.sh.in

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # THIS FILE IS GENERATED FROM tests-config.sh.in
 # Copyright (c) 2013-2014 The Bitcoin Core developers
 # Copyright (c) 2016-2022 The Hush developers