bump version to v0.5.4 (#7139)

Author: simon-mo

docs/source/getting_started/installation.rst

@@ -48,7 +48,7 @@ You can install vLLM using pip:
 
     .. code-block:: console
 
-        $ export VLLM_VERSION=0.5.2 # vLLM's main branch version is currently set to latest released tag
+        $ export VLLM_VERSION=0.5.4 # vLLM's main branch version is currently set to latest released tag
         $ pip install https://vllm-wheels.s3.us-west-2.amazonaws.com/nightly/vllm-${VLLM_VERSION}-cp38-abi3-manylinux1_x86_64.whl
         $ # You can also access a specific commit
         $ # export VLLM_COMMIT=...

vllm/version.py

@@ -9,4 +9,4 @@
                   stacklevel=2)
     __commit__ = "COMMIT_HASH_PLACEHOLDER"
 
-__version__ = "0.5.3.post1"
+__version__ = "0.5.4"