v2.1.20: Fix `embedding_wrapper.c` for Julia 1.11

Summary

This release fixes embedding_wrapper.c for Julia 1.11.

What's Changed

• Fix embedding_wrapper.c for Julia 1.11; also, run CI on 1.11, but skip the incremental=false tests on 1.11 by @ufechner7 in #954
• Bump version from 2.1.19 to 2.1.20 by @DilumAluthge in #977

CI (Continuous Integration)

• CI: Resume testing 32-bit Julia on Windows for Julia 1.6 and 1.10, but keep 1.9 disabled for now by @DilumAluthge in #968
• CI: Use julia-actions/cache in the build-mylib job by @DilumAluthge in #971
• Run macOS CI on both Intel and Apple Silicon by @DilumAluthge in #970

New Contributors

• @ufechner7 made their first contribution in #954

Full Changelog

Full Changelog: v2.1.19...v2.1.20