Set cooldown in dependabot

[p-r-a-v-i-n]

following up from #2427 (review)

Ref for cooldown: https://docs.zizmor.sh/audits/#dependabot-cooldown

[ulgens]

+1 on the intention, but I think it's better to have zizmor in place and let it allow to enforce this rule, instead of adding it manually.

[p-r-a-v-i-n]

+1 on the intention, but I think it's better to have zizmor in place and let it allow to enforce this rule, instead of adding it manually.

Thanks @ulgens , this would be new learning for me.