Parquet format should not depend on slf4j-nop

Format 2.4.0 no longer shades slf4j-api and slf4j-nop. The no-op logger implementation should be removed. It was previously included to avoid stderr messages complaining that there was no log implementation for the shaded SLF4J. Now that the user's log implementation will be used, it is no longer necessary and is dangerous because it could make it to the runtime classpath and discard logs.