Closes #786.

Problem

Right now we list every dependency that was either added or removed in the Markdown job summary. For pull requests with large number of changes, this goes over the summary size limit, as reported in #786.

Changes in this pull request

I removed the list of changed dependencies from the job summary. They can still be found in the logs. My rationale for this change is that the list of changed dependencies is likely not what users most care about in the summary: the list of vulnerable dependencies, license infringements and such are what's key. The way we were currently listing the dependency changes in the summary was not of much value either way as we were not differentiating between added dependencies and removed dependencies, we were listing all of them (whether added or removed).

This is not the most elegant way to address this issue, but it is the most straightforward.