add missing opensuse dependencies for building workspace

Running kdesrc-build workspace to catch these.

I used ci-images/suse-qt66/Dockerfile as a reference when adding packages that were missing. I didn't add every package in that Dockerfile into this merge request; I only added what was needed to build workspace.

Only weird thing was I couldn't find anything in the ci-images/suse-qt66/Dockerfile that provided a gi-docgen binary, so I had to use the python3-gi-docgen zypper package to get that in.