Fixed: apache/flink#40732 (master - 47e9a82)

[Flink CI]

apache / flink master Build #40732 fixed 5 hrs, 44 mins, 36 secs Zhijiang 47e9a82 CHANGESET → [FLINK-14394][network] Remove unnecessary interface method BufferProvider#requestBufferBlocking Currently BufferProvider#requestBufferBlocking method is only used for unit tests, so we could refactor the related tests to use methods of BufferProvider#requestBufferBuilderBlocking or BufferProvider#requestBuffer instead. Then we could remove this legacy method completely to clean up the interface.