Use go-version-file in setup-go to reference go.mod

Author: jehiah

.github/workflows/ci.yml

@@ -7,6 +7,6 @@ jobs:
     - uses: actions/checkout@v4
     - uses: actions/setup-go@v5
       with:
-        go-version: '1.25'
+        go-version-file: go.mod
     - run: make test