fix: modify uncorrect db name.

[dakele123]

What was changed

modify the uncorrect db name; which should be postgres12

Why?

Checklist

1. Closes #209

2. How was this tested: test in my pc

3. Any docs updates needed? no docs needed.

[CLAassistant]

All committers have signed the CLA.

[robholland]

Looks good, thank you :) Please sign the CLA and I'll get this merged.

[gregbrowndev]

Btw I also had to bump the grafana version as some of the dashboards didn't work properly.

In deployment/grafana/Dockerfile:

FROM grafana/grafana:11.2.0
ADD ./provisioning /etc/grafana/provisioning
ADD ./config.ini /etc/grafana/config.ini
ADD ./dashboards /var/lib/grafana/dashboards

also you can update the docker compose so the tag matches the version in the Dockerfile:

  grafana:
    container_name: grafana
    image: grafana/grafana:11.2.0
    build: "./deployment/grafana"

The latest Grafana version has some useful features, like being able to explore all the metrics without having to write a query:

If you want to merge this PR, I can make a new one with the bumped Grafana version :) Let me know

[robholland]

Fixed by #214