chore: update workflow

Author: ldez

.github/workflows/go.yaml

@@ -8,15 +8,18 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Set up Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version: oldstable
 
       - name: Build
         run: go build -v ./...
 
       - name: Test
         run: go test -v ./...
+
+      - name: Run
+        run: go run ./cmd/whitespace/ ./...