ci(earthly): Pin earthly reference

Earthfile

 VERSION 0.7
 
+IMPORT git.shivering-isles.com/shivering-isles/infrastructure-gitops/images/mirror:v23.11 AS mirror
+
 # build creates a binary release of dnsproxy
 build:
-    FROM git.shivering-isles.com/shivering-isles/infrastructure-gitops/images/mirror+golang
+    FROM mirror+golang
     WORKDIR /go-workdir
     ARG DNSPROXY_VERSION
     ENV CGO_ENABLED=0
@@ -13,7 +15,7 @@ build:
     SAVE ARTIFACT ./dnsproxy AS LOCAL local-output/dnsproxy
 
 container-internal:
-    FROM git.shivering-isles.com/shivering-isles/infrastructure-gitops/images/mirror+distroless-static
+    FROM mirror+distroless-static
     # renovate: datasource=git-tags depName=https://git.shivering-isles.com/github-mirror/AdguardTeam/dnsproxy.git
     ARG DNSPROXY_VERSION
     ENV DNSPROXY_VERSION=${DNSPROXY_VERSION}
@@ -23,7 +25,7 @@ container-internal:
 
 # container builds the dnsproxy container
 container:
-    FROM git.shivering-isles.com/shivering-isles/infrastructure-gitops/images/mirror+golang
+    FROM mirror+golang
     # renovate: datasource=git-tags depName=https://git.shivering-isles.com/github-mirror/AdguardTeam/dnsproxy.git
     ARG DNSPROXY_VERSION=v0.54.0
     ARG registry=quay.io/shivering-isles/dnsproxy