chore(deps): update docker.io/library/alpine docker tag to v3.18.4

This MR contains the following updates:

Package	Update	Change
docker.io/library/alpine	patch	3.18.3 -> 3.18.4

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images/mirror/Earthfile

@@ -16,7 +16,7 @@ golang:
     DO +MIRROR --image=docker.io/library/golang:1.21.1-bookworm
 
 alpine:
-    DO +MIRROR --image=docker.io/library/alpine:3.18.3
+    DO +MIRROR --image=docker.io/library/alpine:3.18.4
 
 trivy:
     DO +MIRROR --image=docker.io/aquasec/trivy:0.45.1