[BUG] navtopology cron job does not start properly

[Zotan]

Describe the bug

I get an email from cron every hour with the subject:
Cron navcron@nav navtopology --l2 --vlan

And contents:
navtopology is already running (53066)

To Reproduce

Install nav from debian buster packages

Expected behavior

no emails from cron

Environment (please complete the following information):

Nav 5.9.1 on Debian Buster from the packages.

[lunkwill42]

This is actually a duplicate of #2877 and was fixed in #2878

[lunkwill42]

(I might add that the Debian packages were updated with this patch over a week ago, so the fix should be available)

[Zotan]

I had missed the 5.9.1-2 packages and was still on 5.9.1-1. Thanks!