remove shallowCopy for ARC/ORC (#20070)

* remove shallowCopy for ARC/ORC

* use move

* fix

* more fixes

* typo

* Update lib/system.nim

* follow

* add nodestroy

* move

* copy string

* add a changelog entry

Co-authored-by: xflywind <43030857+xflywind@users.noreply.github.com>
Co-authored-by: Andreas Rumpf <rumpf_a@web.de>

lib/pure/asynchttpserver.nim

@@ -170,7 +170,7 @@ proc processRequest(
   server: AsyncHttpServer,
   req: FutureVar[Request],
   client: AsyncSocket,
-  address: string,
+  address: sink string,
   lineFut: FutureVar[string],
   callback: proc (request: Request): Future[void] {.closure, gcsafe.},
 ): Future[bool] {.async.} =
@@ -184,7 +184,10 @@ proc processRequest(
   # \n
   request.headers.clear()
   request.body = ""
-  request.hostname.shallowCopy(address)
+  when defined(gcArc) or defined(gcOrc):
+    request.hostname = address
+  else:
+    request.hostname.shallowCopy(address)
   assert client != nil
   request.client = client