Bump golang in /test/fakeintake

Bumps golang from 1.24.9-alpine3.22 to 1.25.3-alpine3.22.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.25.3-alpine3.22
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

test/fakeintake/Dockerfile

@@ -2,7 +2,7 @@
 # syntax=docker/dockerfile:1
 
 ## Build
-FROM golang:1.24.10-alpine3.22 AS build
+FROM golang:1.25.4-alpine3.22 AS build
 
 # need gcc to build with CGO_ENABLED=1
 # need musl-dev to get stdlib.h