ci: fix lint job

Author: caarlos0

.github/workflows/lint.yml

@@ -14,6 +14,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: stable
       - uses: golangci/golangci-lint-action@v6
         with:
           # Optional: golangci-lint command line arguments.