Update gcr.io/kaniko-project/executor Docker tag to v0.18.0

This MR contains the following updates:

Package	Type	Update	Change
gcr.io/kaniko-project/executor	image-name	minor	v0.16.0 -> v0.18.0

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changed title from Update gcr.io/kaniko-project/executor Docker tag to v0.17.1 to Update gcr.io/kaniko-project/executor Docker tag to v0.18.0

changed the description

added 19 commits

• 5372e81c...875166ac - 18 commits from branch master
• 7a92d9ca - Update gcr.io/kaniko-project/executor Docker tag to v0.18.0

Compare with previous version

merged

mentioned in commit 1da01556