reduce CPU requests across observability, authentik, bind, woodpecker (#248)

Reduce reserved-but-unused CPU requests across several workloads (limits unchanged).

| Workload | CPU request |
|---|---|
| vmstorage (vmcluster) | 1 → 250m |
| vmagent | 500m → 250m |
| authentik server | 250m → 50m |
| authentik worker | 250m → 100m |
| bind authoritative | 100m → 20m |
| bind externaldns | 100m → 20m |
| bind resolvers | 100m → 20m |
| woodpecker agent | 100m → 50m |

Reviewed-on: #248
Co-authored-by: Ben Vincent <ben@unkin.net>
Co-committed-by: Ben Vincent <ben@unkin.net>

apps/overlays/au-syd1/authentik/values.yaml

@@ -83,7 +83,7 @@ server:
       cpu: "2"
       memory: 2Gi
     requests:
-      cpu: 250m
+      cpu: 50m
       memory: 512Mi
 
 worker:
@@ -95,7 +95,7 @@ worker:
       cpu: "2"
       memory: 2Gi
     requests:
-      cpu: 250m
+      cpu: 100m
       memory: 512Mi
 
 postgresql: