package/assimp: bump version to 5.1.3
For details see [1], [2] and [3].
[1] https://github.com/assimp/assimp/releases/tag/v5.1.1
[2] https://github.com/assimp/assimp/releases/tag/v5.1.2
[3] https://github.com/assimp/assimp/releases/tag/v5.1.3
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>