chore(deps): update ghcr.io/atuinsh/atuin docker tag to v18.6.0 (#2368)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

kubernetes/tools/atuin/values.yaml

@@ -1,6 +1,6 @@
 image:
   repository: "ghcr.io/atuinsh/atuin"
-  tag: "v18.5.0@sha256:80b3aed8b82ba9974c614cf54071f05424e2b9937172c493079d67d7d647e4b1"
+  tag: "v18.6.0@sha256:3694180a8f2b3c7f25f7db5a0a43ed1479107d5c5c0bbd0797c41adb5ab3cc8a"
 
 hostPaths:
 - name: config