prometheus: updated to 2.19.0

2.19.0:
[FEATURE] TSDB: Memory-map full chunks of Head (in-memory) block from disk. This reduces memory footprint and makes restarts faster.
[ENHANCEMENT] Discovery: Added discovery support for Triton global zones.
[ENHANCEMENT] Increased alert resend delay to be more tolerant towards failures.
[ENHANCEMENT] Remote Read: Added prometheus_remote_storage_remote_read_queries_total counter to count total number of remote read queries.
[ENHANCEMEMT] Added time range parameters for label names and label values API.
[ENHANCEMENT] TSDB: Reduced contention in isolation for high load.
[BUGFIX] PromQL: Eliminated collision while checking for duplicate labels.
[BUGFIX] React UI: Don't null out data when clicking on the current tab.
[BUGFIX] PromQL: Correctly track number of samples for a query.
[BUGFIX] PromQL: Return NaN when histogram buckets have 0 observations.
[BUGFIX] TSDB: Fix incorrect query results when using Prometheus with remote reads configured

(adam)