Prepare 2.2.1rc2 (#11717)
Prepare 2.2.1rc2 (#11717)

[ci skip-rust]
[ci skip-build-wheels]
pantsbuild/pants,pantsbuild/pants,pantsbuild/pants,pantsbuild/pants,benjyw/pants,benjyw/pants,benjyw/pants,pantsbuild/pants,pantsbuild/pants,benjyw/pants,benjyw/pants,benjyw/pants,benjyw/pants,pantsbuild/pants