Merge bitcoin/bitcoin#23220: ci: Reduce Windows memory for faster scheduling

146831f80a ci: Reduce Windows memory for faster scheduling (MarcoFalke)

Pull request description:

  A rebased https://github.com/bitcoin/bitcoin/commit/fac3ae2333229109c4c65289fcdd6905d8f94467 from #23043.

  The worst scenario (all caches are invalidated) tested in #23217.

ACKs for top commit:
  MarcoFalke:
    cr ACK 146831f80a

Tree-SHA512: 8d5101a7a47139f5358601def3932d199da500ba255740c09a170378a3e6fd9b0ff4ce5a7c0f5f1eb4f26f905f55b47077759b265b67acf9b7b01eec89b7e5da

.cirrus.yml

@@ -79,7 +79,7 @@ task:
   << : *FILTER_TEMPLATE
   windows_container:
     cpu: 4
-    memory: 16G
+    memory: 8G
     image: cirrusci/windowsservercore:visualstudio2019
   timeout_in: 120m
   env: