bash: Invoke bash using /usr/bin/env

Signed-off-by: a1346054 <36859588+a1346054@users.noreply.github.com>

ci/builddeps.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Copyright 2021 Simon McVittie
 # SPDX-License-Identifier: LGPL-2.0-or-later
 

demos/flatpak-run.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # For this to work you first have to run these commands:
 #  curl -O http://sdk.gnome.org/nightly/keys/nightly.gpg
 #  flatpak --user remote-add --gpg-key=nightly.gpg gnome-nightly http://sdk.gnome.org/nightly/repo/

tests/test-run.sh

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

tests/test-specifying-pidns.sh

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

tests/test-specifying-userns.sh

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