upgrade: paperless-ngx increase memory 1Gi -> 2Gi

v2.20.14 OOMKills at 1Gi during search index rebuild on upgrade.
Bumped to 2Gi request=limit to handle startup index operations.

Co-Authored-By: Service Upgrade Agent <noreply@viktorbarzin.me>

stacks/paperless-ngx/main.tf

@@ -178,10 +178,10 @@ resource "kubernetes_deployment" "paperless-ngx" {
           resources {
             requests = {
               cpu    = "50m"
-              memory = "1Gi"
+              memory = "2Gi"
             }
             limits = {
-              memory = "1Gi"
+              memory = "2Gi"
             }
           }