feat(container): update image ghcr.io/atuinsh/atuin to v18.4.0

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/atuinsh/atuin	minor	18.3.0 -> 18.4.0

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[github-actions]

--- HelmRelease: services/atuin Deployment: services/atuin

+++ HelmRelease: services/atuin Deployment: services/atuin

@@ -66,13 +66,13 @@

           value: 'true'
         - name: ATUIN_PORT
           value: '80'
         envFrom:
         - secretRef:
             name: atuin-secret
-        image: ghcr.io/atuinsh/atuin:18.3.0@sha256:678def8e9d59652a502759ca431f9c5b54ebdd5e9361507c7fcf24705c9862e0
+        image: ghcr.io/atuinsh/atuin:18.4.0@sha256:8c6fa0aea944bf2a39665c9c69df1c2c0f9c05207bda5b942d450142285e3ee1
         name: app
         resources:
           limits:
             memory: 512Mi
           requests:
             cpu: 10m

[github-actions]

--- kubernetes/apps/services/atuin/app Kustomization: flux-system/atuin HelmRelease: services/atuin

+++ kubernetes/apps/services/atuin/app Kustomization: flux-system/atuin HelmRelease: services/atuin

@@ -46,13 +46,13 @@

               ATUIN_PORT: 80
             envFrom:
             - secretRef:
                 name: atuin-secret
             image:
               repository: ghcr.io/atuinsh/atuin
-              tag: 18.3.0@sha256:678def8e9d59652a502759ca431f9c5b54ebdd5e9361507c7fcf24705c9862e0
+              tag: 18.4.0@sha256:8c6fa0aea944bf2a39665c9c69df1c2c0f9c05207bda5b942d450142285e3ee1
             resources:
               limits:
                 memory: 512Mi
               requests:
                 cpu: 10m
                 memory: 128Mi