Fix minio values for rke2 and eks nightly pipeline

With recently enabling the require-drop-all-capabilities policy, minio tenants have been failing to create due to the pool statefulset being blocked by policy:

resource Pod/minio/minio-minio-minio-instance-ss-0-0 was blocked due to the following policies 
require-drop-all-capabilities:
  drop-all-capabilities: 'validation failure: Containers must drop all Linux capabilities
    by setting the fields spec.containers[*].securityContext.capabilities.drop, spec.initContainers[*].securityContext.capabilities.drop,
    and spec.ephemeralContainers[*].securityContext.capabilities.drop to `ALL`.'

Adjust the rke2 and eks values for minio accordingly. This issue has not been observed in the k3d pipelines, so eks and rke2 overrides are likely the culprit.