### What this PR does / why we need it?
Remove transformer pins for v0.9.1-dev, because we already release the
v0.9.1rc2 with right transformer version
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
doctest CI passed
- vLLM version: v0.10.0
- vLLM main:
7e6544c797
Signed-off-by: Yikun Jiang <yikunkero@gmail.com>