Update dependency go to 1.25

Author: renovate[bot]

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Setup
         uses: actions/setup-go@v4
         with:
-          go-version: "1.20"
+          go-version: "1.25"
       - name: Build otelinit
         run: go build -v ./...
       - name: Build test stub