Bump vendor/gitlab.com/openconnect/ocserv from aaf2a53 to 39f274f

Bumps [vendor/gitlab.com/openconnect/ocserv](https://gitlab.com/openconnect/ocserv) from `aaf2a53` to `39f274f`.
- [Release notes](https://gitlab.com/openconnect/ocserv/tags)
- [Commits](https://gitlab.com/openconnect/ocserv/compare/aaf2a532462f3734c1241518accf42b04c40591c...39f274fb01cb14550a49774531ee03929ee58d07)

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

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