dev-postgres: Pin CF CLI to v6.43.0
dev-postgres: Pin CF CLI to v6.43.0

Pin CF CLI to v6.43.0 since it is failing in pickelhelm test due to cf
oauth-token not being available.

[#166429038](https://www.pivotaltracker.com/story/show/166429038)

Co-authored-by: Cameron Moreau <bb182232047a5ea6392d4742be27991bfb9b5655@pivotal.io>
Co-authored-by: Barack Karavani <d90c13280473e40d0128a7cb829e286478c028c5@pivotal.io>

cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release,cloudfoundry-incubator/cf-networking-release