Chore(deps): Bump passport-oauth2 in /Preversion/backend-old

Bumps [passport-oauth2](https://github.com/jaredhanson/passport-oauth2) from 1.5.0 to 1.6.1.
- [Release notes](https://github.com/jaredhanson/passport-oauth2/releases)
- [Changelog](https://github.com/jaredhanson/passport-oauth2/blob/master/CHANGELOG.md)
- [Commits](jaredhanson/passport-oauth2@v1.5.0...v1.6.1)

---
updated-dependencies:
- dependency-name: passport-oauth2
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>