net-mgmt/prometheus2: update to 2.43.0

ChangeLog: https://github.com/prometheus/prometheus/blob/main/CHANGELOG.md

• Promtool: Add HTTP client configuration to query commands.
• Scrape: Add include_scrape_configs to include scrape configs from different files.
• HTTP client: Add no_proxy to exclude URLs from proxied requests.
• HTTP client: Add proxy_from_enviroment to read proxies from env variables.
• API: Add support for setting lookback delta per query via the API.
• API: Change HTTP status code from 503/422 to 499 if a request is canceled.
• Scrape: Allow exemplars for all metric types.
• TSDB: Add metrics for head chunks and WAL folders size.
• TSDB: Automatically remove incorrect snapshot with index that is ahead of WAL.
• TSDB: Improve Prometheus parser error outputs to be more comprehensible.
• UI: Scope group by labels to metric in autocompletion.
• Scrape: Fix prometheus_target_scrape_pool_target_limit metric not set before reloading.
• TSDB: Correctly update prometheus_tsdb_head_chunks_removed_total and prometheus_tsdb_head_chunks metrics when reading WAL.
• TSDB: Use the correct unit (seconds) when recording out-of-order append deltas in the prometheus_tsdb_sample_ooo_delta metric.

PR: 270914
Reported by: David O'Rourke <dor.bsd@xm0.uk> (maintainer)