Fix release contributors script (#530)
Fix release contributors script (#530)

I noticed tons of

```
GraphQL: Could not resolve to an issue or pull request with the number of XXXX. (repository.issue)
```

because the dependabot PR descriptions include references to lots of
Issues/PRs in other repos.
open-telemetry/opentelemetry-java-contrib,open-telemetry/opentelemetry-java-contrib,open-telemetry/opentelemetry-java-contrib