Replace ExecutionContexts.sameThreadExecutionContext with parasitic · apache/pekko-http@b13812c

Unused import

Unused import

parameter ec in method shutdown is never used

method getFirst in class Attributes is deprecated (since Akka 2.5.7): Attributes should always be most specific, use get[T]

discarding unmoored doc comment

discarding unmoored doc comment

discarding unmoored doc comment

@nowarn annotation does not suppress any warnings

@nowarn annotation does not suppress any warnings

@nowarn annotation does not suppress any warnings

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