upgrade to 0.18.0 (#7502)

### What this PR does / why we need it?
1. upgrade to 0.18.0
2. ensure kernel_block_sizes is int for Eagle drafter
### Does this PR introduce _any_ user-facing change?

### How was this patch tested?

- vLLM version: v0.17.0
- vLLM main:
8b6325758c

---------

Signed-off-by: Meihan-chen <jcccx.cmh@gmail.com>
Signed-off-by: hfadzxy <starmoon_zhang@163.com>
Co-authored-by: hfadzxy <starmoon_zhang@163.com>

.github/workflows/schedule_update_estimated_time.yaml

@@ -23,7 +23,7 @@ jobs:
     name: e2e-test
     strategy:
       matrix:
-        vllm_version: [v0.17.0]
+        vllm_version: [v0.18.0]
         type: [full, light]
     uses: ./.github/workflows/_e2e_test.yaml
     with: