Update .github/workflows/openapi-spec.yml

Co-authored-by: Luca Rinaldi <l.rinaldi@arduino.cc>

Author: dido18

.github/workflows/openapi-spec.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v5
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: go.mod
 
       - name: Install oasdiff
         run: go install github.com/oasdiff/oasdiff@latest