Change access modifier to package private for RoutingDsl.{Route,RouteParam}

[WojciechMazur]

The static private modifier for these 2 classes was incorrect. In the previous versions of Scala it compiled due to existence of a bug in the compiler.
The mentioned bug was minimized and discussed in scala/scala3#21599 and was discovered after merging a fix scala/scala3#21362
Problem was discovered by Scala 3 Open Community Build in:

• playframework/playframework - build logs
• playframework/omnidoc - build logs

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[mkurz]

Thanks!

[mkurz]

@Mergifyio backport 3.0.x 2.9.x

[mergify]

backport 3.0.x 2.9.x

✅ Backports have been created

• #13005 [3.0.x] Change access modifier to package private for RoutingDsl.{Route,RouteParam} (backport #13003) by @WojciechMazur has been created for branch 3.0.x
• #13006 [2.9.x] Change access modifier to package private for RoutingDsl.{Route,RouteParam} (backport #13003) by @WojciechMazur has been created for branch 2.9.x