Periodic job to bump images in sec-scanners-config.yaml

[mfaizanse]

We need to manually bump the images in sec-scanners-config.yaml on main branch in all of our repositories, which can be automated.
Implement a github action in each of the repositories (eventing-manager, nats-manager and eventing-publisher-proxy) which runs every midnight and checks if the images in the sec-scanners-config.yaml in the respective repository, needs to be bumped or not. If yes, then automatically opens a PR with the bumped images.

Hint: We can reuse stuff from #361.

Question:

• If we set the image tag to main, will the security scanner always pull the latest tag with main?

AC(s):

• Periodic job in eventing-manager.
• Periodic job in nats-manager.
• Periodic job in eventing-publisher-proxy.
• Update the duties of security guy to check the jobs every morning.

[friedrichwilken]

I think this is no longer needed since in the sec-scanner-config.yaml on main

1. we want to have the manager-image always to be main.
2. we want the RC-tag always be updated by releases to the next release, as explained in this ticket