staging: Adapt loader bzr usage

[1] https://grafana.softwareheritage.org/d/a164a7f0339f99e89cea5cb47e9be617/kubernetes-compute-resources-workload?orgId=1&var-datasource=Thanos&var-cluster=archive-staging-rke2&var-namespace=swh&var-workload=loader-bzr&var-type=deployment&from=now-24h&to=now

Refs. swh/infra/sysadm-environment#4883

swh/values/staging.yaml

@@ -29,8 +29,8 @@ loaders:
       autoScaling:
         maxReplicaCount: 1
     bzr:
-      requestedMemory: 256Mi
-      requestedCpu: 200m
+      requestedMemory: 512Mi
+      requestedCpu: 250m
       queues:
         - swh.loader.bzr.tasks.LoadBazaar
       autoScaling: