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 <[email protected]>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1185
Reviewed-by: bircni <[email protected]>
Co-authored-by: Renovate Bot <[email protected]>

e2e/gitea_api.go

@@ -9,7 +9,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/base64"
-	"encoding/json"
+	"encoding/json/v2"
 	"errors"
 	"fmt"
 	"io"