Bump fancy collections

• bump fancy collections to 0.2 (fixes pickling bug)
• added test to check if pickling of SaQC works
• removed deprecated DictOfSeries methods

requested review from @schaefed

assigned to @palmb

Maybe we should add an entry to the CHNGELOG for the removed methods?

added 1 commit

• e6e67f0e - removed `to_df` usage in docs, improved CHANGELOG.md

Compare with previous version

resolved all threads

approved this merge request

added 1 commit

• 230a135c - fixed typo, to re-trigger pipeline

Compare with previous version

merged

mentioned in commit 4494a478