Enable ESLint package updates in dependabot config

[butterybread]

Updates to the ESLint package have been disabled because there was a conflict with an eslint plugin.
https://stackoverflow.com/questions/69578685/eslint-broken-rules-with-suggestions-must-set-the-meta-hassuggestions-propert
The react hooks plugin has not yet had a stable release that includes the changes required for ESLint 8.
So for now we will keep using ESLint 7.
This ticket serves as a reminder to occasionally check if we can move to ESLint 8.

[butterybread]

We could move to ESLint 8 if we install the next version of the plugin:
See: facebook/react#22545

[wouterdb]

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