[Letux-kernel] Long-Term kernels

[H. Nikolaus Schaller]

v5.9.16 was just tagged [EOL].

According to https://www.kernel.org/category/releases.html the long-term kernels will be:

- 5.10
- 5.4
- 4.19
- 4.14
- 4.9
- 4.4	(maintenance ends in 2 months - but we anyways have no letux-4.4)

For Letux-Kernels we will follow this scheme.

BR,
Nikolaus