Update sbt-pekko-build to 0.4.2 (#648) · apache/pekko-http@21292e2

ubuntu-latest pipelines will use ubuntu-24.04 soon. For more details, see https://github.com/actions/runner-images/issues/10636

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/impl/engine/rendering/DateHeaderRendering.scala#L82

The value matched by Idle is bound to s, which may be used under the

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/test/scala/org/apache/pekko/http/scaladsl/ClientTransportWithCustomResolverSpec.scala#L89

Adaptation of argument list by inserting () is deprecated: this is unlikely to be what you want.

Compile everything: http-core/src/test/scala/org/apache/pekko/http/scaladsl/settings/ConnectionPoolSettingsSpec.scala#L165

local method expectError in value <local ConnectionPoolSettingsSpec> is never used

Compile everything: http-tests/src/test/scala/org/apache/pekko/http/scaladsl/RouteJavaScalaDslConversionSpec.scala#L37

local val scalaRoute in value <local RouteJavaScalaDslConversionSpec> is never used

Compile everything: http-tests/src/test/scala/org/apache/pekko/http/scaladsl/RouteJavaScalaDslConversionSpec.scala#L50

local val javaRoute in value <local RouteJavaScalaDslConversionSpec> is never used

Compile everything: http-tests/src/test/scala/org/apache/pekko/http/scaladsl/server/SizeLimitSpec.scala#L42

Unused import

Compile everything: http-tests/src/test/scala/org/apache/pekko/http/scaladsl/server/directives/FileUploadDirectivesSpec.scala#L33

Unused import

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