Merge bitcoin/bitcoin#22061: ci: Bump multiprocess memory

fa0bfc5 ci: Bump multiprocess memory (MarcoFalke)

Pull request description:

  Fixes #22059

ACKs for top commit:
  ryanofsky:
    Code review ACK fa0bfc5. Thanks for the update, and interesting to know about #21869. It looks like relevant build https://cirrus-ci.com/task/4807455453478912 is succeeding too
  fanquake:
    ACK fa0bfc5

Tree-SHA512: f6e49aadf33199ffa7960c8da0b81bdc5ffea61f373e1b0367d000cdbd214614374b9f1a8b3ce9b8270e6d13a24a2029ab07bddb48e44c86dcb687d645e5ef34

.cirrus.yml

@@ -168,8 +168,11 @@ task:
   << : *GLOBAL_TASK_TEMPLATE
   container:
     image: ubuntu:focal
+    cpu: 4
+    memory: 16G  # The default memory is sometimes just a bit too small, so double everything
   env:
     << : *CIRRUS_EPHEMERAL_WORKER_TEMPLATE_ENV
+    MAKEJOBS: "-j8"
     FILE_ENV: "./ci/test/00_setup_env_native_multiprocess.sh"
 
 task: