Bump prometheus-net.AspNetCore from 2.1.3 to 3.0.3 in /src/Miningcore (#554)
Bump prometheus-net.AspNetCore from 2.1.3 to 3.0.3 in /src/Miningcore (#554)

Bumps [prometheus-net.AspNetCore](https://github.com/prometheus-net/prometheus-net) from 2.1.3 to 3.0.3.
- [Release notes](https://github.com/prometheus-net/prometheus-net/releases)
- [Changelog](https://github.com/prometheus-net/prometheus-net/blob/master/History)
- [Commits](https://github.com/prometheus-net/prometheus-net/compare/v2.1.3...v3.0.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
coinfoundry/miningcore,coinfoundry/miningcore,coinfoundry/miningcore,coinfoundry/miningcore