build(deps): bump defguard_wireguard_rs from v0.4.7 to v0.7.8

Bumps [defguard_wireguard_rs](https://github.com/DefGuard/wireguard-rs) from v0.4.7 to v0.7.8.
- [Release notes](https://github.com/DefGuard/wireguard-rs/releases)
- [Commits](DefGuard/wireguard-rs@ef1cf37...7162395)

---
updated-dependencies:
- dependency-name: defguard_wireguard_rs
  dependency-version: 7162395593ee9c013d36f284754a5fb3a331cb4f
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]