chore(deps): update docker.io/golang docker tag to v1.26.4

Author: renovate[bot]

v8/Dockerfile.multiarch

@@ -36,7 +36,7 @@ WORKDIR /build/services/web
 RUN make pull-assets
 
 
-FROM docker.io/golang:1.25.11-alpine3.23@sha256:ba6ba81bf21dfcccdb8c9832c5f09d775cd19a6ed1b323b3220949361958ca30 AS go-builder
+FROM docker.io/golang:1.26.4-alpine3.23@sha256:eb5a920799142c2fe9ec705cfa0ebcc4380e2e2f041b84e9ae5c6d82a2e56c82 AS go-builder
 
 ARG VERSION="8.0.1"
 ARG TARGETARCH