Pin sam2 commit (#217)

* pin sam2 repo to commit before renaming and path changes

* update repo dependency to match upstream renaming

runner/docker/Dockerfile.segment_anything_2

@@ -1,6 +1,6 @@
 ARG BASE_IMAGE=livepeer/ai-runner:base
 FROM ${BASE_IMAGE}
 
-RUN pip install --no-cache-dir torch==2.3.1 torchvision==0.18.1 torchaudio==2.3.1 xformers==0.0.27 git+https://github.com/facebookresearch/segment-anything-2.git@main#egg=sam-2
+RUN pip install --no-cache-dir torch==2.3.1 torchvision==0.18.1 torchaudio==2.3.1 xformers==0.0.27 git+https://github.com/facebookresearch/sam2.git@0f6515ae853c40420ea8e3dd250f8031bbf03023#egg=sam-2
 
 CMD ["uvicorn", "app.main:app", "--log-config", "app/cfg/uvicorn_logging_config.json", "--host", "0.0.0.0", "--port", "8000"]