Fix OverflowError in offsets_for_times() when timestamp is non-finite float

[koteshyelamati]

Bug

offsets_for_times() converts each timestamp value with int(ts). If ts is float('inf') or float('nan'), this raises an OverflowError (or ValueError for nan) instead of the expected ValueError with a clear message.

Reproducer:

consumer = KafkaConsumer(bootstrap_servers='localhost:9092')
tp = TopicPartition('my-topic', 0)
consumer.offsets_for_times({tp: float('inf')})
# OverflowError: cannot convert float infinity to integer

Fix

Wrap int(ts) in a try/except that catches ValueError, TypeError, and OverflowError, and re-raises as ValueError with a descriptive message — consistent with the existing negative-timestamp check.

[dpkp]

Why did or do you expect a ValueError in this case? The docstring only claims to raise ValueError for negative timestamps. I'm not sure how changing OverflowError to ValueError improves this api contract?