krb5: add missing findutils dependency (#38440)

Co-authored-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

var/spack/repos/builtin/packages/krb5/package.py

@@ -34,6 +34,7 @@ class Krb5(AutotoolsPackage):
     depends_on("openssl@:1", when="@:1.19")
     depends_on("openssl")
     depends_on("gettext")
+    depends_on("findutils", type="build")
 
     variant(
         "shared", default=True, description="install shared libraries if True, static if false"