scripts: Alter shebangs to /usr/bin/env bash

in order to increase portability across systems where /bin/ does not contain bash.

contrib/actions/free-runner-space.sh

-#!/bin/bash
+#!/usr/bin/env bash
 
 # For a List of pre-installed packages on the runner image see
 # https://github.com/actions/runner-images/tree/main?tab=readme-ov-file#available-images

contrib/actions/show-system-info.sh

-#!/bin/bash
+#!/usr/bin/env bash
 
 echo "-- CPU --"
 cat /proc/cpuinfo

contrib/depdot.sh

-#!/bin/bash
+#!/usr/bin/env bash
 
 # Script to output the dependency graph of Gluon's packages
 # Limitations:

contrib/lsupgrade.sh

-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 # Script to list all upgrade scripts in a clear manner

scripts/feeds.sh

-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 

scripts/module_check.sh

-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e
 

scripts/patch.sh

-#!/bin/bash
+#!/usr/bin/env bash
 # shellcheck enable=check-unassigned-uppercase
 
 set -e

scripts/update-patches.sh

-#!/bin/bash
+#!/usr/bin/env bash
 # shellcheck enable=check-unassigned-uppercase
 
 set -e

scripts/update.sh

-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e