CI: some packages require max configuration

.cirrus.yml

@@ -1,7 +1,9 @@
 container:
   image: termux/package-builder:latest
-  cpu: 4
-  memory: 16
+
+  # Max configuration required by few large packages such as `rust`.
+  cpu: 8
+  memory: 24
 
 ##
 ##  When doing release builds (branch 'master'), update Docker image if
@@ -50,7 +52,7 @@ task:
     - Lint packages
 
   environment:
-    TERMUX_MAKE_PROCESSES: 4
+    TERMUX_MAKE_PROCESSES: 8
     matrix:
       - TERMUX_ARCH: aarch64
       - TERMUX_ARCH: arm