Update exporter-toolkit

[SuperQ]

• Update Go to 1.23.
• Replace go-kit/log with slog.

[SuperQ]

Incorporated suggestions.

[tjhop]

@matthiasr is there any chance you could take a look at this sometime? The graphite_exporter imports the statsd_exporter to use the mapper.MetricMapping struct, so it seems this is a prereq to updating the graphite_exporter to fully use log/slog

[matthiasr]

Thank you both 🙏 🙏 🙏