[3.0.x] StreamedResponse headers map is now case insensitive

[mkurz]

• Fixes Streamed response headers are case sensitive #908

[mkurz]

In Scala 3 we can't override class parameter's "getter"s anymore:

[error] -- [E120] Naming Error: /home/runner/work/play-ws/play-ws/play-ahc-ws-standalone/src/main/scala/play/api/libs/ws/ahc/StreamedResponse.scala:56:15 
[error] 56 |  override def headers(): Map[String, scala.collection.Seq[String]] = {
[error]    |               ^
[error]    |Double definition:
[error]    |private[this] val headers: Map[String, scala.collection.Seq[String]] in class StreamedResponse at line 45 and
[error]    |override def headers(): Map[String, scala.collection.Seq[String]] in class StreamedResponse at line 56
[error] one error found

[mkurz]

@Mergifyio backport main

[mergify]

backport main

✅ Backports have been created

• #912 [main] [3.0.x] StreamedResponse headers map is now case insensitive (backport #909) by @mkurz has been created for branch main

[mkurz]

@Mergifyio backport 2.2.x

[mergify]

backport 2.2.x

✅ Backports have been created

• #913 [2.2.x] [3.0.x] StreamedResponse headers map is now case insensitive (backport #909) by @mkurz has been created for branch 2.2.x