build(deps): bump github.com/prometheus/client_model from 0.6.2 to 0.6.3

Bumps [github.com/prometheus/client_model](https://github.com/prometheus/client_model) from 0.6.2 to 0.6.3.
- [Release notes](https://github.com/prometheus/client_model/releases)
- [Commits](https://github.com/prometheus/client_model/compare/v0.6.2...v0.6.3)

---
updated-dependencies:
- dependency-name: github.com/prometheus/client_model
  dependency-version: 0.6.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
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