Set up default renovate config with regex to handle goreleaser-pro updates

[mowies]

This PR takes the renovate config from https://github.com/open-telemetry/opentelemetry-collector (as I found this to be mostly also applicable here, maybe a bit overkill still) and adds a custom regex manager that handles updates of the version field for GoReleaser inside the goreleaser-action usages.
Example of an occurrence that this should cover:

opentelemetry-collector-releases/.github/workflows/base-release.yaml

Lines 83 to 88 in 11530fd

	- uses: goreleaser/goreleaser-action@286f3b13b1b49da4ac219696163fb8c1c93e1200 # v6.0.0
	with:
	distribution: goreleaser-pro
	version: v2.3.2
	workdir: distributions/${{ inputs.distribution }}
	args: release --clean --split --timeout 2h --release-header-tmpl=../../.github/release-template.md

Hopefully, this works for #668 but renovate config updates are hard to test before merging. The local setup didn't scream, which is a good sign. I will close the issue manually once I'm sure that this PR fixes it and otherwise provide follow-up PRs.

[mx-psi]

Looks reasonable to me, let's merge it and try it out!