[docker] Bump golang from 1.25.3-alpine to 1.25.4-alpine in /apps/grafana-proxy (#128)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

apps/grafana-proxy/Dockerfile

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # Building environment
-FROM golang:1.25.3-alpine AS build
+FROM golang:1.25.4-alpine AS build
 
 WORKDIR /workspace/apps/grafana-proxy