ci-operator/step-registry/ipi/conf: Drop to 10m

It's been 1000m since it landed in de3de20 (step-registry: add
configure and install IPI steps, 2020-01-14, #6708), but it's a pretty
simple container (just write a config file), so Steve suggestes 10m as
more appropriate [1].

[1]: #7625 (comment)

ci-operator/step-registry/ipi/conf/ipi-conf-ref.yaml

@@ -4,7 +4,7 @@ ref:
  commands: ipi-conf-commands.sh
  resources:
  requests:
- cpu: 1000m
+ cpu: 10m
  memory: 100Mi
  documentation: |-
  The IPI configure step generates the install-config.yaml file based on the cluster profile and optional input files.