Update Kaniko to v1.7.0

[SaschaSchwarze0]

Changes

Updating Kaniko in our sample build strategies to the new release.

Submitter Checklist

• Includes tests if functionality changed/was added
• Includes docs if changes are user-facing
• Set a kind label on this PR
• Release notes block has been filled in, or marked NONE

Release Notes

Updated Kaniko in the sample build strategies to v1.7.0

[gabemontero]

/approve

[gabemontero]

I won't have time for the next day or two to review / confirm all the relevant spots have been hit @SaschaSchwarze0 - if you don't want to wait for me, please assign someone else to do that and LGTM it

[sbose78]

/lgtm
/approve

[openshift-ci]

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