chore: fix renovate config, add recommended preset

[mowies]

This PR

• fixes the current renovate config to get flagd renovate updates to work again
• groups flagd updates from multiple renovate regex managers into one PR for easier updates
• enables the group:recommended preset so that common monorepo and grouped packages are put into one PR per group (e.g. k8s API packages, or angular monorepo packages)

Related Issues

Fixes #415
Fixes #406

Notes

Result of the config change can be seen in my fork.
Working renovate PR to update flagd: mowies#9
Renovate deps dashboard from my fork: mowies#4

[codecov]

Codecov Report

Merging #418 (6e9c8b4) into main (6ed4cef) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #418   +/-   ##
=======================================
  Coverage   78.12%   78.12%           
=======================================
  Files          12       12           
  Lines         855      855           
=======================================
  Hits          668      668           
  Misses        153      153           
  Partials       34       34           

Flag	Coverage Δ
component-tests	80.28% <ø> (ø)
unit-tests	36.25% <ø> (ø)

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