Add renovate.json for centralized dependency management #25

Job	Run time
build (quay.io/centos/centos:stream9, centos-stream9)	56s
build (docker.io/library/ubuntu:22.04, ubuntu-22.04)	40s
build (docker.io/library/ubuntu:24.04, ubuntu-24.04)	44s
build (quay.io/fedora/fedora:41, fedora-41)	42s
	3m 2s

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