chore(deps): update docker.io/library/golang docker tag to v1.21.1

This MR contains the following updates:

Package	Update	Change
docker.io/library/golang	patch	1.21.0-bookworm -> 1.21.1-bookworm

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images/mirror/Earthfile

@@ -13,7 +13,7 @@ distroless-static:
     DO +MIRROR --image=gcr.io/distroless/static:nonroot@sha256:92d40eea0b5307a94f2ebee3e94095e704015fb41e35fc1fcbd1d151cc282222
 
 golang:
-    DO +MIRROR --image=docker.io/library/golang:1.21.0-bookworm
+    DO +MIRROR --image=docker.io/library/golang:1.21.1-bookworm
 
 alpine:
     DO +MIRROR --image=docker.io/library/alpine:3.18.3