net-mgmt/prometheus2: Update to 2.36.0

Changes: https://github.com/prometheus/prometheus/releases

PR: 264370

There are a lot of changes since 2.33.5 which can be viewed at
https://github.com/prometheus/prometheus/releases, but the main change
is that TLS 1.0 and 1.1 are now disabled by default. They can be
re-enabled via the tls_config section of the Prometheus configuration as
documented at
https://prometheus.io/docs/prometheus/latest/configuration/configuration/#tls_config.

Certificates using SHA-1 hash functions are also rejected, this support
can be re-enabled (for now) via some Go debug environment variables:
https://go.dev/doc/go1.18#sha1