PySDM v3.0.0-pre.8

What's Changed

• CI: make the urlcheck job OK to fail by @slayoo in #1708
• breakup example fixes (regenerated notebook, pre-release pip-install header cell) by @slayoo in #1709
• use png graphics in deJong 3_4_5 notebook to save disk space by @slayoo in #1712
• Bump pyrcel from 1.3.2 to 1.3.4 in /examples by @dependabot[bot] in #1713
• Shipway & Hill example: remove debug leftovers by @slayoo in #1716
• Bump vtk from 9.5.0 to 9.5.2 in /examples by @dependabot[bot] in #1715
• CI: new tests-suite strategy by @AgnieszkaZaba in #1706

Full Changelog: v3.0.0-pre.7...v3.0.0-pre.8