bump: Akka 2.9.0-M2, Akka HTTP 10.6.0-M1 #1096

Job	Run time
Compile and test (2.13)	6m 2s
Docs	4m 7s
Compile and test (3.3)	6m 28s
Compile Benchmarks	3m 8s
Checks	1m 32s
Maven tests	3m 23s
sbt scripted tests (gen-scala-server, 2.13)	12m 45s
Gradle tests	5m 16s
sbt scripted tests (gen-java, 2.13)	5m 0s
sbt scripted tests (scala-2_13, 2.13)	8m 13s
sbt scripted tests (scala3, 3.3)	4m 28s
	1h 0m 22s

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