Tenant Security Proxy v5.0.0

[giarc3]

We've released TSP v5.0.0, which has changes to our internal Prometheus dependency and metrics. As part of this, we have removed the tsp_requests_in_flight metric. This metric was not functioning correctly for leased keys and was often misleading. This is a breaking change because we previously recommended configuring a HorizontalPodAutoscaler based on this metric, so you will need to ensure that metric is not being used before upgrading. Our current recommendations for TSP scaling are available here. There are no other breaking changes in this release.