pin transformers <4.55

Signed-off-by: sirutBuasai <sirutbuasai27@outlook.com>

Author: sirutBuasai

.github/workflows/pr-vllm.yml

@@ -311,7 +311,7 @@ jobs:
             uv pip install --system pytest pytest-asyncio
             uv pip install --system -e tests/vllm_test_utils
             uv pip install --system hf_transfer
-            uv pip install --system "transformers<4.56"
+            uv pip install --system "transformers<4.55"
             mkdir src
             mv vllm src/vllm
           '
@@ -593,7 +593,7 @@ jobs:
             uv pip install --system pytest pytest-asyncio
             uv pip install --system -e tests/vllm_test_utils
             uv pip install --system hf_transfer
-            uv pip install --system "transformers<4.56"
+            uv pip install --system "transformers<4.55"
             mkdir src
             mv vllm src/vllm
           '
@@ -875,7 +875,7 @@ jobs:
             uv pip install --system pytest pytest-asyncio
             uv pip install --system -e tests/vllm_test_utils
             uv pip install --system hf_transfer
-            uv pip install --system "transformers<4.56"
+            uv pip install --system "transformers<4.55"
             mkdir src
             mv vllm src/vllm
           '