Revert "[FLINK-36510][rpc] Bump Pekko to 1.1.2, remove Netty 3" #859

Job	Run time
Pre-compile Checks / Basic QA	6m 56s
Default (Java 8) / Compile	44m 16s
Default (Java 8) / E2E (group 1)	2h 13m 11s
Default (Java 8) / Test packaging/licensing	1h 50m 32s
Default (Java 8) / Test (module: core)	36m 10s
Default (Java 8) / E2E (group 2)	2h 35m 1s
Default (Java 8) / Test (module: python)	32m 37s
Default (Java 8) / Test (module: table)	59m 50s
Default (Java 8) / Test (module: connect)	21m 45s
Default (Java 8) / Test (module: tests)	50m 0s
Default (Java 8) / Test (module: misc)	46m 34s
	11h 36m 52s

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