feat(container): update image ghcr.io/twin/gatus to v5.15.0

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/twin/gatus	minor	v5.14.0 -> v5.15.0

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[github-actions]

--- kubernetes/apps/observability/gatus/app Kustomization: flux-system/gatus HelmRelease: observability/gatus

+++ kubernetes/apps/observability/gatus/app Kustomization: flux-system/gatus HelmRelease: observability/gatus

@@ -40,13 +40,13 @@

               WEB_PORT: 80
             envFrom:
             - secretRef:
                 name: gatus-secret
             image:
               repository: ghcr.io/twin/gatus
-              tag: v5.14.0@sha256:acc0c116458a8d65ce48f7caea13881afa20bf5a405bb95230c51430eb9e2313
+              tag: v5.15.0@sha256:45686324db605e57dfa8b0931d8d57fe06298f52685f06aa9654a1f710d461bb
             probes:
               liveness:
                 custom: true
                 enabled: true
                 spec:
                   failureThreshold: 3

[github-actions]

--- HelmRelease: observability/gatus Deployment: observability/gatus

+++ HelmRelease: observability/gatus Deployment: observability/gatus

@@ -99,13 +99,13 @@

           value: Pacific/Auckland
         - name: WEB_PORT
           value: '80'
         envFrom:
         - secretRef:
             name: gatus-secret
-        image: ghcr.io/twin/gatus:v5.14.0@sha256:acc0c116458a8d65ce48f7caea13881afa20bf5a405bb95230c51430eb9e2313
+        image: ghcr.io/twin/gatus:v5.15.0@sha256:45686324db605e57dfa8b0931d8d57fe06298f52685f06aa9654a1f710d461bb
         livenessProbe:
           failureThreshold: 3
           httpGet:
             path: /health
             port: 80
           initialDelaySeconds: 0