try to remove some uses of ActorMaterializer · apache/pekko-http@db3a978

Compile everything: parsing/src/main/scala-2/org/apache/pekko/http/ccompat/pre213macro.scala#L17

Unused import

Compile everything: parsing/src/main/scala-2/org/apache/pekko/http/ccompat/since213macro.scala#L17

Unused import

Compile everything: http-scalafix/scalafix-rules/src/main/scala/org/apache/pekko/http/fix/MigrateToServerBuilder.scala#L31

method args in trait Apply is deprecated: 4.6.0

Compile everything: http-scalafix/scalafix-rules/src/main/scala/org/apache/pekko/http/fix/MigrateToServerBuilder.scala#L45

method args in trait Apply is deprecated: 4.6.0

Compile everything: http-core/src/main/scala/org/apache/pekko/http/scaladsl/model/HttpEntity.scala#L666

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

Compile everything: http-core/src/main/scala/org/apache/pekko/http/impl/engine/http2/Http2Multiplexer.scala#L170