Merge bitcoin#24316: ci: Rename Cirrus CI osx_instance to macos_instance

c49e7db ci: Follow Cirrus CI docs (Hennadii Stepanov)

Pull request description:

  See cirruslabs/cirrus-ci-docs#763.

ACKs for top commit:
  katesalazar:
    ACK c49e7db

Tree-SHA512: b86d571258e2682113833d575ca36a60b108ee38f2d74846b7631a29b9578cad00a29e62a3a1d808b21d2de3a27230f9ac58814c9f9b02d08675e65170ccd7e5

.cirrus.yml

@@ -286,7 +286,7 @@ task:
   brew_install_script:
     - brew install boost libevent qt@5 miniupnpc libnatpmp ccache zeromq qrencode libtool automake gnu-getopt
   << : *GLOBAL_TASK_TEMPLATE
-  osx_instance:
+  macos_instance:
     # Use latest image, but hardcode version to avoid silent upgrades (and breaks)
     image: monterey-xcode-13.2  # https://cirrus-ci.org/guide/macOS
   env: