Add 5.19
Bump 5.18.4 -> 5.18.15
Bump 5.15.47 -> 5.15.58
Bump 5.10.122 -> 5.10.134
Bump 5.4.198 -> 5.4.208
Bump 4.14.283 -> 4.14.290
Bump 4.9.318 -> 4.9.325
Add a milestone for 5.19 as this adds support for the loongarch
CPU architecture.
Signed-off-by: Chris Packham <judge.packham@gmail.com>
