ci(renovate): Add ability to define version extraction

This patch adds the ability to sepcify a regex for version extraction.
This is needed to get the talos upgrades working as expected.

References:
https://github.com/mchestr/home-cluster/blob/62e93c129e32509dc2e5ec9ed77b7b3ebada0538/.github/renovate/regexManagers.json5#L4-L19