0.6.1

specsolve now requires polars below 2.0. On polars 2.0.0, a row's dual can come
back empty, and a model can take about nine times the memory. Nothing else
changes.

• fix(deps): specsolve installs a polars older than 2.0, on which a row's dual can come back empty and a model can take nine times the memory (#1852)
• docs: the published benchmarks are re-measured on specsolve 0.6.0 (#1850)