Update hpu.txt on 1.22.0 branch (#1648)

Set extension SHA for Port: Fix: Round up to sliding window threshold
#307 (#309)

Author: afierka-intel

requirements/hpu.txt

@@ -7,4 +7,4 @@ ray
 triton==3.1.0
 setuptools>=77.0.3
 setuptools-scm>=8
-vllm-hpu-extension @ git+https://github.com/HabanaAI/vllm-hpu-extension.git@ea187b5
+vllm-hpu-extension @ git+https://github.com/HabanaAI/vllm-hpu-extension.git@5135570