Update rdkafka #53

Job	Run time
Construct Cxx interop matrix	2s
Unit tests / Unit tests (5.9)	2m 29s
Unit tests / Unit tests (5.10)	2m 33s
Unit tests / Unit tests (6.0)	2m 46s
Unit tests / Unit tests (nightly-6.1)	3m 16s
Unit tests / Unit tests (nightly-main)	3m 16s
Soundness / API breakage check	2m 47s
Soundness / Unacceptable language check	7s
Soundness / Documentation check	2m 41s
Soundness / Broken symlinks check	4s
Soundness / Format check	53s
Soundness / License headers check	4s
Soundness / Shell check	37s
Soundness / Python lint check	6s
Soundness / YAML lint check	4s
Cxx interop / Linux (5.9)	2m 8s
Cxx interop / Linux (5.10)	2m 13s
Cxx interop / Linux (6.0)	2m 33s
Cxx interop / Linux (nightly-6.1)	2m 59s
Cxx interop / Linux (nightly-main)	2m 57s
	34m 35s

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