fix(scripts): replace hardcoded /bin/bash shebangs

Several helper scripts assumes bash is available at /bin/bash. That breaks on systems
such as NixOS, where bash is resolved from PATH instead of a fixed /bin location and
causes failures like `bad interpreter` during `make format`, e.g., on my host machine:

```sh
$ make format

/PX4-Autopilot/Tools/astyle/check_code_style.sh: /PX4-Autopilot/Tools/astyle/fix_code_style.sh: /bin/bash: bad interpreter: No such file or directory
```

This change switches these entrypoints to `#!/usr/bin/env bash` so they locate bash properly.

No functional changes intended.

Signed-off-by: Onur Özkan <work@onurozkan.dev>

Tools/ci/build_all_runner.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # This script is meant to be used by the build_all.yml workflow in a github runner
 # Please only modify if you know what you are doing
 set -e

Tools/ci/check_msg_versioning.sh

@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 # Copy a git diff between two commits if msg versioning is added
 
 DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )

Tools/ci/package_build_artifacts.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 mkdir artifacts
 cp **/**/*.px4 artifacts/ 2>/dev/null || true

Tools/ci/run_fuzz_tests.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # This script runs the fuzz tests from a given binary for a certain amount of time
 set -e