Guard finally-block logger.info in HTTP access log middleware (#67501)

The ``finally`` block in ``HttpAccessLogMiddleware`` called
``logger.info()`` without exception protection. If ``logger.info()``
raised — broken handler, OOM in the formatter, downstream forwarder
unavailable — and the original ``try`` block was already propagating
an application exception, Python's ``finally``-replacement semantics
would discard the original exception in favour of the logger's, so
uvicorn never saw the real failure.

Wrap the emit in ``contextlib.suppress(Exception)`` so logging failures
never disrupt the application or mask the original exception. The
HTTP response has already been sent to the client by the time we
reach the log emit, so swallowing the logger failure costs nothing
beyond a missing log line for that one request.