chore(deps): update helm release prometheus-blackbox-exporter to v8.15.2

This MR contains the following updates:

Package	Update	Change
prometheus-blackbox-exporter (source)	patch	8.15.1 -> 8.15.2

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Release Notes

prometheus-community/helm-charts (prometheus-blackbox-exporter)

v8.15.2

Compare Source

Prometheus Blackbox Exporter

What's Changed

• [prometheus-blackbox-exporter] fix: only template env if .Values.extraEnv is specified by @​adberger in https://github.com/prometheus-community/helm-charts/pull/4354

Full Changelog: https://github.com/prometheus-community/helm-charts/compare/prometheus-25.20.0...prometheus-blackbox-exporter-8.15.2

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