Update Argo to 2.1.8

Package Merge Request

Package Changes

Update Argo to 2.1.8, latest chart for 2.1.x images.

Package MR

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

For Issue

Closes https://repo1.dso.mil/platform-one/big-bang/apps/core/argocd/-/issues/34

changed milestone to %1.27.0

added argocd statusreview labels

assigned to @micah.nagel

approved this merge request

merged

mentioned in commit 8f0fb977

mentioned in issue #1069 (closed)