chore(update-{deprecated-links,test-cmd-list},runLint): update shebang

The test scripts have had the shebang #!/bin/bash, but Bash is not
necessarily located at /bin/bash.  For example, it does not located
there in FreeBSD and MINIX.  As we require /bin/bash in the shebang of
the pre-commit scripts, any attempts to commit changes in such a
system would be blocked by the pre-commit hook.

In this patch, we update the shebang to `#!/usr/bin/env bash`, which
is a widely used workaround for this issue.

Note: I have not changed the shebang of
`test/docker/*/install-packages.sh` as these seem to be always called
in a GNU/Linux container, where /bin/bash exists.

Author: akinomyoga

test/deprecated/update-deprecated-links

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -euo pipefail
 
 is_tracked_by_git()

test/runLint

@@ -1,4 +1,5 @@
-#!/bin/bash -u
+#!/usr/bin/env bash
+set -u
 
 gitgrep()
 {

test/update-test-cmd-list

@@ -1,4 +1,5 @@
-#!/bin/bash -eu
+#!/usr/bin/env bash
+set -eu
 
 mydir=$(
     cd "$(dirname "$0")"