Updated promtail git tag

Package Merge Request

Package Changes

https://repo1.dso.mil/big-bang/apps/sandbox/promtail/-/blob/6.8.1-bb.0/CHANGELOG.md

Package MR

https://repo1.dso.mil/big-bang/apps/sandbox/promtail/-/merge_requests/23

For Issue

Closes https://repo1.dso.mil/big-bang/apps/sandbox/promtail/-/issues/15

chart/values.yaml

@@ -512,7 +512,7 @@ promtail:
   git:
     repo: https://repo1.dso.mil/platform-one/big-bang/apps/sandbox/promtail.git
     path: "./chart"
-    tag: "6.7.2-bb.0"
+    tag: "6.8.1-bb.0"
 
   # -- Flux reconciliation overrides specifically for the Promtail Package
   flux: {}