[dependencies] Update golang Docker tag to v1.25 (#3276)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=$BUILDPLATFORM golang:1.24-alpine AS builder
+FROM --platform=$BUILDPLATFORM golang:1.25-alpine AS builder
 LABEL maintainer="nekohasekai <[email protected]>"
 COPY . /go/src/github.com/sagernet/sing-box
 WORKDIR /go/src/github.com/sagernet/sing-box