fix: pass sentry_logs_level only to sentry-sdk versions that accept it

[lesnik512]

Released in 1.8.0 and still in 1.9.0: every Sentry-enabled service on sentry-sdk 2.1 through 2.24
crashes at bootstrap.

TypeError: LoggingIntegration.__init__() got an unexpected keyword argument 'sentry_logs_level'

sentry_instrument.py passed sentry_logs_level=None unconditionally (added in #231). That parameter
arrived in sentry-sdk 2.25.0, bisected against PyPI; the declared floor is sentry-sdk>=2.1.

Reproduced at the floor with a plain config, no test scaffolding:

FreeBootstrapper(bootstrap_config=FreeConfig(service_name="svc", sentry_dsn="...")).bootstrap()

The fix

A capability check computed once at import, rather than raising the floor to >=2.25 and dropping 24
sentry-sdk releases:

SENTRY_LOGS_LEVEL_SUPPORTED: typing.Final = (
    "sentry_logs_level" in inspect.signature(LoggingIntegration.__init__).parameters
)

This is not a workaround for an unsupported keyword. Below 2.25 there is no Sentry Logs feature at
all, so SentryLogsHandler does not exist and there is no wasted formatting to suppress. The saving
#186 shipped is only available where the feature is, and omitting the keyword elsewhere is the
accurate thing to do, not a compromise.

Verified on both sides:

sentry-sdk	bootstrap	logging integration
2.1.0 (floor)	OK, was TypeError	_breadcrumb_handler, _handler; no logs handler exists
2.67.1 (current)	OK, unchanged	logs handler None, so #186's saving still applies

CI would have caught this, one day later

scripts/floor_smoke.py free fails on main with the same TypeError and passes with this change.
It is only reached by the lowest-direct job, which does not run on pull requests, so #231 never
exercised a floor. The daily cadence added in #233 would have opened a tracking issue at 06:00 UTC.

(Measuring that took two attempts: uv pip install <path> is a copied install, not editable, so
swapping the source file under a built venv proves nothing. The result above comes from reinstalling
each version.)

Test

One parametrized invariant over the capability flag: passed when the SDK accepts it, omitted when it
does not. It asserts through _build_integrations() rather than sentry_sdk.init, so it does not
depend on SDK global state.

324 tests, ruff, ty clean.

Wants a 1.9.1 immediately: the current release is broken for anyone not on a recent sentry-sdk.