v1.12.1

Fix up some breaks in the projection extension handling.

What's Changed

• fix: fall back to epsg by @gadomski in #1505
• fix: fall back to epsg in crs_string, too by @gadomski in #1510
• fix: migrate by default by @gadomski in #1509
• release: v1.12.1 by @gadomski in #1511

Full Changelog: v1.12.0...v1.12.1