fix shebang in various bash scripts (#910)

buildtools/update_schema.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Regenerates typescript files with schema and sql for grist documents.
 # This needs to run whenever the document schema is changed in the data

buildtools/update_type_info.sh

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

sandbox/bundle_as_wheel.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # Package up Grist code as a stand-alone wheel.
 # This is useful for grist-static.

sandbox/pyodide/build_packages.sh

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

sandbox/pyodide/setup.sh

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

test/test_under_docker.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # This runs browser tests with the server started using docker, to
 # catch any configuration problems.