chore(deps): update dependency ops to v3.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
ops (changelog)	==3.7.1 → ==3.8.0

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Release Notes

canonical/operator (ops)

v3.8.0

Compare Source

Features

• Note the socket path in Pebble tracing spans (#​2555)

Fixes

• Treat remote unit zero as explicit (#​2454)
• Ensure resources are cleaned up in testing.Context (#​2506)
• Close SQLite storage in Harness.cleanup() (#​2507)
• Restore sys.breakpointhook on _Manager teardown (#​2542)
• Avoid errors in finalisation due to already-closed websocket (#​2548)
• Use the correct value for JUJU_HOOK_NAME when objects contain dashes (#​2552)
• Avoid double-closing the framework in testing teardown (#​2561)
• Don't leak exec I/O threads when waiting on the change fails (#​2558)
• Take Pebble defaults into consideration when consistency checking Checks (#​2567)
• Tear down Runtime.exec() when the charm raises (#​2581)

Documentation

• Fix small issues in K8s tutorial (#​2540)
• Document user-secret observer lifecycle and secret-changed semantics (#​2522)
• Replace CoC with link to Ubuntu Code of Conduct (#​2564)
• Add a small note about -W error in the unit test how-to (#​2560)
• Add doc about subordinate charms (#​2455)
• Add 26.04 to the versions page and mark 2.23 as LTS (#​2517)
• Clarify storage-detaching applies to both machine and K8s charms (#​2554)
• Add guidance about names of workload-less charms (#​2496)
• Fix first unit tests command in machine charm tutorial (#​2574)
• Extend security explanation page to cover SEC0030 V1.3 gaps (#​2571)
• Move docs to canonical.com/juju/docs/ops (#​2545)
• Fix docstring of _Event._is_action_event (#​2580)

Tests

• Treat warnings as errors when running unit tests (#​2541)
• Fix mock_temp_dir fixture's open() patch (#​2553)
• Add integration tests for ops.hookcmds (#​2520, #​2562)
• Fix integration test flakes on Juju 3 k8s and Juju 4 secrets (#​2584)

Refactoring

• Avoid yaml.load() to silence security scanner false positives (#​2523)
• Replace jsonpatch with an inline dict-diff (#​2578)
• Move the otlp-json package to be a regular ops-tracing module (#​2585)
• Distinguish between init and attribute types in testing state classes (#​2331)

CI

• Remove obsolete containerd workaround from integration workflow (#​2519)
• Use the sys.monitoring coverage core (#​2518)

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[danielvnguyen]

No breaking changes found. Upstream 3.8.0 release notes do not indicate any intentional backward-incompatible API removals. Local regression check passed: 200 passed, 14 xfailed, 0 failed.