builds-builder: bump to 0.0.121-20241003135043-98c2199c
From 0.0.117-20240902122920-3b0529c7 To 0.0.121-20241003135043-98c2199c See https://gitlab.wikimedia.org/repos/cloud/toolforge/builds-builder/-/releases
Signed-off-by: David Caro dcaro@wikimedia.org