Bump akka.version from 2.6.10 to 2.6.11

Bumps akka.version from 2.6.10 to 2.6.11.

Updates akka-actor_2.13 from 2.6.10 to 2.6.11

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Updates akka-remote_2.13 from 2.6.10 to 2.6.11

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Updates akka-cluster_2.13 from 2.6.10 to 2.6.11

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Updates akka-cluster-tools_2.13 from 2.6.10 to 2.6.11

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Updates akka-slf4j_2.13 from 2.6.10 to 2.6.11

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Updates akka-serialization-jackson_2.13 from 2.6.10 to 2.6.11

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Updates akka-testkit_2.13 from 2.6.10 to 2.6.11

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