build(deps): bump bitflags from 2.6.0 to 2.8.0 in /nym-vpn-core (#1935)

Bumps [bitflags](https://github.com/bitflags/bitflags) from 2.6.0 to 2.8.0.
- [Release notes](https://github.com/bitflags/bitflags/releases)
- [Changelog](https://github.com/bitflags/bitflags/blob/main/CHANGELOG.md)
- [Commits](bitflags/bitflags@2.6.0...2.8.0)

---
updated-dependencies:
- dependency-name: bitflags
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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