mesa: update to at least version 21.1
21.1 contains a fix @timothee.chabat contributed upstream to fix errors due to very small buffer sizes in previous versions of mesa that would give rise to errors such as
vtkTextureObject.cxx:1025 ERR| vtkTextureObject (0x4f22a50): Attempt to use a texture buffer exceeding your hardware's limits. This can happen when trying to color by cell data with a large dataset. Hardware limit is 65536 values while 220392 was requested.