Merge bitcoin/bitcoin#21931: ci: Bump cirrus fuzz CPUs to avoid timeout

fa397a6 ci: Bump cirrus fuzz CPUs to avoid timeout (MarcoFalke)

Pull request description:

ACKs for top commit:
  hebasto:
    ACK fa397a6, let's try it.

Tree-SHA512: 7e06dda66c71d76e5fd144f6b5bb10f0bcac72feb15bd0f400ef08ba4dcb92558319401ef5f9d3822376affceb2192df1903b3a79c0ab2d7283ca21454054dea

.cirrus.yml

@@ -156,8 +156,11 @@ task:
   << : *GLOBAL_TASK_TEMPLATE
   container:
     image: ubuntu:focal
+    cpu: 4  # Increase CPU and memory to avoid timeout
+    memory: 16G
   env:
     << : *CIRRUS_EPHEMERAL_WORKER_TEMPLATE_ENV
+    MAKEJOBS: "-j8"
     FILE_ENV: "./ci/test/00_setup_env_native_fuzz.sh"
 
 task: