v1.21.2

WriteVTK v1.21.2

Diff since v1.21.1

Merged pull requests:

• Bump codecov/codecov-action from 4 to 5 (#158) (@dependabot[bot])
• Fix memory leak (#160) (@svchb)

Closed issues:

• Error: type Polys has no field vtk_id (#155)
• Is it possible to write a unstructured cell whose connectivity is defined with points at other processor? (#157)