feat: upgrade to transformers v5 (#3200)

* feat: upgrade to transformers v5

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* fixed the pre-commit

Signed-off-by: Peter Staar <taa@zurich.ibm.com>

* allow transformers v4

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* Allow transformers 4.x in vlm extra, clean up annotations

Signed-off-by: Christoph Auer <cau@zurich.ibm.com>

---------

Signed-off-by: Peter Staar <taa@zurich.ibm.com>
Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>
Signed-off-by: Christoph Auer <cau@zurich.ibm.com>
Co-authored-by: Michele Dolfi <dol@zurich.ibm.com>
Co-authored-by: Christoph Auer <cau@zurich.ibm.com>