Figure out why dependabot doesn't work

Rust Version

stable

Diesel Version

main

Diesel Features

all of them

Database Version

all of them

Operating System Version

Github

What happened?

Our dependabot configuration doesn't seem to work: https://github.com/diesel-rs/diesel/blob/main/.github/dependabot.yml

We need to figure out why

What did you expect to happen?

Dependabot runs regulary and updates the following dependencies:

• Rust crates (needs to make sure to stay compatible for old versions for public dependencies)
• Rust toolchain (needs to run once every 6 weeks)
• Github actions

There should be a cooldown period of 1 week

Checklist

• I have already looked over the issue tracker and the discussion forum for similar possible closed issues.

• This issue can be reproduced on Rust's stable channel. (Please submit the issue in the Rust issue tracker instead if that's not the case)

• This issue can be reproduced without requiring a third party crate