go mod redisgraph-go/v2: revised the module path to append the new major version number.

[filipecosta90]

In the module’s go.mod file, revised the module path to append the new major version number. Given that the module path is the module’s identifier, this change effectively creates a new module. It also changes the package path, ensuring that developers won’t unintentionally import a version that breaks their code. Instead, those wanting to upgrade will explicitly replace occurrences of the old path with the new one.