Update ek upgrade job image to bb base image

Package Owner Merge Request

Package Changes

What package changes are included with this merge request? The more detail here the better!

• Modified Elastic/Kibana upgradeJob image from gitlab/kubectl:13.9.0 to big-bang/base:8.4

Links to all MRs that are associated with this change are required.

• https://repo1.dso.mil/platform-one/big-bang/apps/core/elasticsearch-kibana/-/merge_requests/58

Additional Details

Also, include any issues closed with "Closes #ISSUENUMBER". See example:

Closes https://repo1.dso.mil/platform-one/big-bang/apps/core/elasticsearch-kibana/-/issues/22

Add any labels for affected packages so that they are deployed in CI. See example:

Once the MR is ready for review also add the status::review label.