fix(partitioning): lower swap minimum from 4GB to 2GB for small VMs

roles/partitioning/defaults/main.yml

@@ -152,6 +152,6 @@ partitioning_swap_size_gb: >-
     ((partitioning_memory_mb / 1024) >= 16.0)
     | ternary(
         (partitioning_memory_mb / 2048) | int,
-        [partitioning_memory_mb / 1024, 4.0] | max | int
+        [partitioning_memory_mb / 1024, 2.0] | max | int
       )
   }}