v2.9.0 has wrong version string

```
# go install github.com/vektra/mockery/v2@v2.9.0
# mockery --version                             
21 Jul 21 14:14 CEST INF Starting mockery dry-run=false version=v0.0.0-dev
v0.0.0-dev
```

version reported is v0.0.0-dev
same is put up in generated files

```
// Code generated by mockery v0.0.0-dev. DO NOT EDIT.
```