no dependabot in WFSim

[JoranAngevaare]

What is the problem / what does the code in this PR do
As requested by @terliuk , maybe we can run dependabot somewhere else to avoid cluttering the PRs and receiving thousands of emails.

How does it work?
Check if the requirements are compatible with the software here instead:
https://github.com/XENONnT/ax_env

One added benefit is that we can also use the same package in strax, straxen, pema etc. avoiding doing all the dependencies multiple times

What will dependabot still do for WFSim?

• Check updates for the docs (aren't many so we should be fine)
• Check the version of strax and straxen
• Check github actions changes, but there shouldn't be a lot - we can disable if needed later

PR family:

• Run dependabot remotely AxFoundation/strax#683
• Run dependabot remote straxen#1008
• remote dependabot pema#204
• no dependabot in WFSim #358
• run dependabot remote reprox#54

[coveralls]

Coverage increased (+0.1%) to 81.459% when pulling 67142be on no_dependabot into 8c58d16 on master.