Update dependency go to v1.25.4

Author: renovate[bot]

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v6
         with:
-          go-version: "1.25.3"
+          go-version: "1.25.4"
 
       - name: Install dependencies
         run: make setup

go.mod

@@ -2,7 +2,7 @@ module github.com/harbur/golang-gin-starter
 
 go 1.24.3
 
-toolchain go1.25.3
+toolchain go1.25.4
 
 require (
 	github.com/gin-gonic/gin v1.11.0