Adopt cloudshell-snmp 6.0 / cloudshell-snmp-autoload 3.0 (pysnmp 7) — Python 3.12/3.13

[nahumtimerman]

What

Adapts this package to cloudshell-snmp 6.0.0 and cloudshell-snmp-autoload 3.0.0 (pysnmp 7, asyncio-based), enabling Python 3.12/3.13.

Changes

• requirements.txt: cloudshell-snmp~=5.0 → cloudshell-snmp>=6.0,<7.0; cloudshell-snmp-autoload>=2.0.1,<3.0 → cloudshell-snmp-autoload>=3.0,<4.0
• version.txt: 7.0.1 → 7.1.0 (minor bump — adapter-level change)
• setup.py: python_requires>=3.9, classifiers 3.9–3.13 (was ~=3.7)
• CI: reusable workflow package-tox-py-37-39.yml → package-tox-py-39.yml; tox envlist py{37,39} → py39; sdist --format zip → plain sdist

No source-code changes were needed — the public APIs of cloudshell-snmp 6.0 / cloudshell-snmp-autoload 3.0 are drop-in compatible with this package's usage (GenericSNMPAutoload, SnmpService, autoload table services).

Evidence

• Unit tests: 74/74 passed on Python 3.9 (pysnmp 7.1.21) and Python 3.13 (pysnmp 7.1.29), zero test modifications.
• Live smoke (py3.13): ran the real CiscoSnmpAutoloadFlow._autoload_flow → CiscoGenericSNMPAutoload.discover() against a snmpsim recording of a Cisco Catalyst (community rec001). Discovered: Vendor=Cisco, Model=Catalyst4948e10ge, OS 12.2(54)SG1, sysName sw9003-if-12-6.cisco.com; structure: 1 chassis, 1 module, 1 power port, 52 ports.
• pre-commit (pyupgrade/isort/black/flake8): passed on all touched files.
• Upstream libraries are backed by a 143-real-device parity gate against the 5.x/2.x implementations.

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