Update rdkafka #52

Job	Run time
Construct Cxx interop matrix	6s
Unit tests / Unit tests (5.9)	2m 34s
Unit tests / Unit tests (5.10)	2m 22s
Unit tests / Unit tests (6.0)	2m 49s
Unit tests / Unit tests (nightly-6.1)	3m 11s
Unit tests / Unit tests (nightly-main)	3m 18s
Soundness / API breakage check	2m 35s
Soundness / Documentation check	2m 57s
Soundness / Format check	40s
Soundness / Broken symlinks check	7s
Soundness / License headers check	7s
Soundness / Python lint check	8s
Soundness / Shell check	33s
Soundness / Unacceptable language check	4s
Soundness / YAML lint check	5s
Cxx interop / Linux (5.9)	2m 13s
Cxx interop / Linux (5.10)	2m 9s
Cxx interop / Linux (6.0)	2m 26s
Cxx interop / Linux (nightly-6.1)	2m 58s
Cxx interop / Linux (nightly-main)	3m 4s
	34m 26s

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