Upgrade CURL to 8.16.0

[kingcrimsontianyu]

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[kingcrimsontianyu]

/ok to test

[TomAugspurger]

I've rerun my manual test from #823, and it still fails on this branch unfortunately.

I've also tried to add a moto-based unit test:

def test_read_with_special_characters(s3_base):
    bucket_name = "bucket"
    object_name = "date=2025-09-15"
    data = b"file content"
    with s3_context(
        s3_base=s3_base, bucket=bucket_name, files={object_name: bytes(data)}
    ) as server_address:
        with kvikio.RemoteFile.open_s3_url(f"s3://{bucket_name}/{object_name}") as f:
            assert f.nbytes() == len(data)
            got = bytearray(len(data))
            assert f.read(got) == len(got)

Unfortunately, it doesn't fail on branch-25.10 or this branch. So however moto is handling tokens, it isn't emulating this portion the same as S3.