tests/ech_tests.sh: sync shebang with rest of bash scripts

Closes #17001

diff --git a/tests/ech_tests.sh b/tests/ech_tests.sh
index 1746f1651164742c93b4e803c68b3bd7c8de9f10..b83a82d644e36eb3bf16846a36b723360ef2b592 100755 (executable)
--- a/tests/ech_tests.sh
+++ b/tests/ech_tests.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #***************************************************************************
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 #  Project                     ___| | | |  _ \| |