### What this PR does / why we need it?
This PR update the prefixcache threshold for qwen3-32b-int from 0.4 to
0.8, as the baseline has been improved.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
By running the test
- vLLM version: v0.11.0
- vLLM main:
2918c1b49c
Signed-off-by: jiangyunfan1 <jiangyunfan1@h-partners.com>