VERSION: bump to 2.29.0-rc.0
VERSION: bump to 2.29.0-rc.0

Signed-off-by: Frederic Branczyk <be573f521a508b499399d1fa7c86d0d9ce29e56d@gmail.com>

keegancsmith/prometheus,prometheus/prometheus,prometheus/prometheus,prometheus/prometheus,keegancsmith/prometheus,prometheus/prometheus,alileza/prometheus,keegancsmith/prometheus,alileza/prometheus,alileza/prometheus,keegancsmith/prometheus,alileza/prometheus,keegancsmith/prometheus,prometheus/prometheus,alileza/prometheus