tests: Run lint tests with detected bash

When we invoke a shell script directly, the system selects a bash binary
that might be different from the one detected by find_program('bash').
Explicitly use the one detected by Meson, matching the behavior of our
other test() invocations on shell scripts.

Fixes test failure on Windows in GitHub Actions CI:

    stdout: 1: UNKNOWN: Windows Subsystem for Linux has no installed distributions.
    stdout: 2: UNKNOWN: Distributions can be installed by visiting the Microsoft Store:
    stdout: 3: UNKNOWN: https://aka.ms/wslstore

Found-by: Benoit Pierre <benoit.pierre@gmail.com>
Fixes: d7601f7eed ("Incorporate some lint checks into `meson test`")

tests/meson.build

@@ -15,7 +15,9 @@ lint_scripts = [
 if have_bash
   foreach test_name : lint_scripts
     test(
-      test_name, files(test_name),
+      test_name,
+      bash,
+      args : [files(test_name)],
       env : test_env,
       suite : ['lint', 'no-valgrind'],
       protocol : 'tap',