Bump metrics-exporter-prometheus from 0.13.1 to 0.15.1

[dependabot[bot]]

Bumps metrics-exporter-prometheus from 0.13.1 to 0.15.1.

Commits

• f84efc4 chore: Release
• 20b6ec5 metrics-exporter-promethus: update CHANGELOG
• 9f86b53 Try fixing the Discord invite link... again.
• db56631 Update Discord invite link.
• 654c3a1 metrics-exporter-prometheus: use hyper-rustls (#489)
• 4c002c4 typo fix in CHANGELOG.md (#487)
• 787b170 chore: Release
• b48ed78 update changelog
• 82513b3 Relax bounds on some metrics_util::registry::Registry methods (#484)
• ce9084b permit trailing commans in describe macros (#483)
• Additional commits viewable in compare view

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