fix(qe): fix broken shebang in query-engine-wasm/build.sh

`#!/bin/bash` is non-portable and only works on some systems which has
bash in that location, which is not actually standard or necessarily
expected.

The only two absolute paths one can rely on in portable scripts are
`#!/bin/sh` (which is a POSIX standard) and `#!/usr/bin/env` (which is
not technically mandated by a formal standard but is de-facto
implemented on all Unix systems).

None of my systems have a usable bash installation in `/bin/bash`.

My Linux system only has bash in `/run/current-system/sw/bin/bash`, so the
script fails with `sh: line 2: ./build.sh: cannot execute: required file
not found`.

My macOS system has an ancient version of bash shipped with the system
installed as `/bin/bash` (which Apple last updated in 2007 and will
never ever update anymore for license reasons since bash 4+ switched to
GPLv3; it's likely to be removed in future macOS versions though as
macOS has long replaced bash with zsh as its shell of choice), and in
some ways it's worse than not having any since modern bash scripts that
assume bash 4 or 5 often fail or produce incorrect results with it. This
specific script accidentally happens to work anyway, but the correct
bash installation to use on this system is still `/opt/homebrew/bin/bash`.

Anything other than `/bin/sh` (be it `bash` or `python` or `node`) can
only be dispatched via `/usr/bin/env` if a script is intended to be used
on more than one machine because it's not possible to predict where the
interpreter is going to be at.

query-engine/query-engine-wasm/build.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # Call this script as `./build.sh <npm_version>`
 set -euo pipefail