net/gobgp: upgrade 2.6.0 -> 2.11.0
PR: 241763
Approved by: nork@ninth-nine.com (maintainer timeout)
Relnotes: https://github.com/osrg/gobgp/releases/tag/v2.7.0
https://github.com/osrg/gobgp/releases/tag/v2.8.0 https://github.com/osrg/gobgp/releases/tag/v2.9.0 https://github.com/osrg/gobgp/releases/tag/v2.10.0 https://github.com/osrg/gobgp/releases/tag/v2.11.0