Update Python shebangs to explicitly use python3

Signed-off-by: pakagronglb <[email protected]>

Author: pakagronglb

.github/scripts/conformance-client.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """Conformance client for python-tuf, part of tuf-conformance"""
 
 # Copyright 2024 tuf-conformance contributors

examples/client/client

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """TUF Client Example"""
 
 # Copyright 2012 - 2017, New York University and the TUF contributors

examples/repository/repo

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2021-2022 python-tuf contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0
 

examples/uploader/uploader

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2021-2022 python-tuf contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0
 

tests/simple_server.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 # Copyright 2012 - 2017, New York University and the TUF contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0

tuf/api/serialization/json.py

@@ -1,8 +1,14 @@
 # Copyright New York University and the TUF contributors
 # SPDX-License-Identifier: MIT OR Apache-2.0
 
-"""JSON de/serialization code."""
-
+"""``tuf.api.serialization.json`` module provides concrete implementations to
+serialize and deserialize TUF role metadata to and from the JSON wireline
+format for transportation, and to serialize the 'signed' part of TUF role
+metadata to the OLPC Canonical JSON format for signature generation and
+verification.
+"""
+
+# We should not have shadowed stdlib json but that milk spilled already
 # ruff: noqa: A005
 
 from __future__ import annotations