mosquitto docker image / multiple digest changes in past 3 days / suspicious?

[reefland]

I have my mosquitto image with SHA pinned at:

docker.io/library/eclipse-mosquitto:2.0.18@sha256:c1322c707de51ee034b9fe2204975d8fd716ed6b8a5a39a3dffe53ec024dc30d

Over the past 3 days RenovateBot reported many digest updates for this version which does not seem like typical activity for this image. It seems suspicious to me. Something going on??