Merge bitcoin/bitcoin#25483: Revert "ci: Increase CPU number for "Win64 native" task"

b1d2fb4ceb Revert "ci: Increase CPU number for "Win64 native" task" (Hennadii Stepanov)

Pull request description:

  This reverts commit 849cf967a3.

  It seems this should [improve](https://github.com/bitcoin/bitcoin/pull/25460#discussion_r907268911) the total CI throughput.

ACKs for top commit:
  MarcoFalke:
    review ACK b1d2fb4ceb

Tree-SHA512: 833665bbea00b695dd1c600c6a47943d47b1a2a3560886b2056544cf62542d6f91b1f2e157ad082b02b67922f1fff14029da35b1a9d85339c2bf526f41b41836

.cirrus.yml

@@ -97,7 +97,7 @@ task:
   name: "Win64 native [vs2022]"
   << : *FILTER_TEMPLATE
   windows_container:
-    cpu: 6
+    cpu: 4
     memory: 8G
     image: cirrusci/windowsservercore:visualstudio2022
   timeout_in: 120m