Bump vendor/gitlab.com/openconnect/ocserv from b69bef3 to d6b1859 (…

…#141)

Bumps [vendor/gitlab.com/openconnect/ocserv](https://gitlab.com/openconnect/ocserv) from `b69bef3` to `d6b1859`.
- [Release notes](https://gitlab.com/openconnect/ocserv/tags)
- [Commits](https://gitlab.com/openconnect/ocserv/compare/b69bef3c3b0026a1360945c275bd5655243e63ab...d6b18598cda306c35956e41bafa7920dd8dc29c8)

---
updated-dependencies:
- dependency-name: vendor/gitlab.com/openconnect/ocserv
  dependency-type: direct:production
...

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