Some distributions (notably, debian bookworm) have deprecated the
`python` interpreter in favor of `python3`. Since our scripts are
python3 anyway, use the proper numbered version in shebang to make
scripts easily executable.
(cherry picked from commit
480dcdef9af36283273fdd88021ee525f7a7f287)
-#!/usr/bin/env python
+#!/usr/bin/env python3
#
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
-#!/usr/bin/env python
+#!/usr/bin/env python3
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
-#!/usr/bin/env python
+#!/usr/bin/env python3
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
-#!/usr/bin/env python
+#!/usr/bin/env python3
############################################################################
# Copyright (c) 2018, Valentin Lab
# All rights reserved.