error with installation

brevo GO package, once installed, can not be used, as it is marked as "not found". checked the versions with `go mod tidy` and got this:

```
go: github.com/<redacted> imports
        github.com/getbrevo/brevo-go: module github.com/getbrevo/brevo-go@latest found (v1.1.3), but does not contain package github.com/getbrevo/brevo-go
```