Merge pull request #30519 from jessfraz/shopt

Adjust "nuke-graph-directory.sh" shebang to be explicitly Bash (includes a Bashism as of https://github.com/docker/docker/pull/27869)

contrib/nuke-graph-directory.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 set -e
 
 dir="$1"