chore: update deps, adapt lint, use json v2 (#1185)

- Raised go to 1.27
- Adopted json v2
- Sync lint config from gitea
- Fixed all issues

Co-authored-by: silverwind <me@silverwind.io>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1185
Reviewed-by: bircni <bircni@icloud.com>
Co-authored-by: Renovate Bot <renovate-bot@gitea.com>

act/artifacts/server_test.go

@@ -7,7 +7,7 @@ package artifacts
 import (
 	"bytes"
 	"compress/gzip"
-	"encoding/json"
+	"encoding/json/v2"
 	"io"
 	"maps"
 	"net/http"