chore: fix go.mod location

Author: meltsufin

.github/workflows/librariangen-ci.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version-file: "go.mod"
+          go-version-file: "internal/librariangen/go.mod"
 
       - name: Display Go version
         run: go version