Update dependency prometheus/blackbox_exporter to v0.22.0

This MR contains the following updates:

Package	Type	Update	Change
prometheus/blackbox_exporter	ironbank-github	minor	v0.21.1 -> v0.22.0
prometheus/blackbox_exporter		minor	v0.21.1 -> v0.22.0

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Release Notes

prometheus/blackbox_exporter

v0.22.0

Compare Source

• [FEATURE] HTTP: Add skip_resolve_phase_with_proxy option. #​944
• [ENHANCEMENT] OAuth: Use Blackbox Exporter user agent when doing OAuth2 authenticated requests. #​948
• [ENHANCEMENT] Print usage and help to stdout instead of stderr. #​928

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