bump loggregatorlib

5de5c4e add new implementation of collector registrar
888b219 renamed collector registrar into legacy collector registrar

automatic promotion by GoCD workflow Loggregatorlib/135 > UnitTests/1 > UnitTests
use new collector registrar in metron

- add integration test for collector registration

[#79030122]

Signed-off-by: Andrew Poydence <apoydence@pivotal.io>
install missing gnatsd dependency in bin/test

[#79030122]

Signed-off-by: Andrew Poydence <apoydence@pivotal.io>