Fix: LMCache default branch is 'dev' not 'main'

vllm/Dockerfile

@@ -94,10 +94,10 @@ RUN cd flashinfer && \
     uv build --wheel --no-build-isolation -o /wheels
 
 FROM build-base AS build-lmcache
-# Bleeding edge: build from main branch (v0.4.2+)
+# Bleeding edge: build from dev branch (v0.4.2+)
 RUN git clone https://github.com/LMCache/LMCache.git && \
     cd LMCache && \
-    git checkout main && \
+    git checkout dev && \
 # PyTorch version is dated in LMCache
     sed -i '/torch/d' pyproject.toml && \
     uv pip install setuptools_scm && \