PMM-7 Pick up Go version from

 go.mod

Author: ademidoff

.github/workflows/toolkit.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v6
       with:
-        go-version: '1.25'
+        go-version-file: ${{ github.workspace }}/go.mod
     - name: Build
       run: cd src/go; make linux-amd64; cd ../../