Bump undefsafe from 2.0.2 to 2.0.5 in /example/server (flutter-stripe#579)

Bumps [undefsafe](https://github.com/remy/undefsafe) from 2.0.2 to 2.0.5.
- [Release notes](https://github.com/remy/undefsafe/releases)
- [Commits](remy/undefsafe@v2.0.2...v2.0.5)

---
updated-dependencies:
- dependency-name: undefsafe
  dependency-type: indirect
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]