Update client3:core to 3.9.6 #15677

Job	Run time
Jmh CookieDecodeBenchmark	0s
Jmh EndpointBenchmark	0s
Build and Test (ubuntu-latest, 2.12.18, graal_graalvm@17)	5m 40s
Jmh CachedDateHeaderBenchmark	0s
Build and Test (ubuntu-latest, 2.12.18, temurin@8)	5m 21s
Jmh HttpCollectEval	0s
Jmh HttpCombineEval	0s
Build and Test (ubuntu-latest, 2.13.12, graal_graalvm@17)	5m 39s
Jmh HttpNestedFlatMapEval	0s
Build and Test (ubuntu-latest, 2.13.12, temurin@8)	5m 41s
Jmh HttpRouteTextPerf	0s
Build and Test (ubuntu-latest, 3.3.1, graal_graalvm@17)	5m 38s
Unsafe Scoverage (ubuntu-latest, 2.13.12, temurin@8)	5m 22s
Build and Test (ubuntu-latest, 3.3.1, temurin@8)	5m 39s
Release Drafter (ubuntu-latest, 2.13.10, temurin@8)	8s
Jmh ProbeContentTypeBenchmark	0s
Jmh SchemeDecodeBenchmark	0s
Jmh ServerInboundHandlerBenchmark	0s
Jmh UtilBenchmark	0s
Cache Jmh benchmarks	0s
Publish Artifacts	0s
	39m 8s

Provide feedback