pyiron_atomistics 0.3.9

What's Changed

• Add gpaw as dependency for integration tests by @jan-janssen in #1237
• update pyiron_base by @jan-janssen in #1238
• Use coveralls action by @jan-janssen in #1239
• Test Lower bounds by @jan-janssen in #1240
• Test older version of matplotlib by @jan-janssen in #1241
• Switch from setup.py to pyproject.toml by @jan-janssen in #1242

Full Changelog: pyiron_atomistics-0.3.8...pyiron_atomistics-0.3.9