Dockerfile: bump CADGENBENCH_SHA to 1747493 (Hub-only fixtures)

cadgenbench main now resolves fixtures exclusively from the Hub
dataset repos: the wheel-bundled _data/ and the in-repo data/ folder
are both gone (commit 1747493). The Space's Settings variables
CADGENBENCH_DATA_REPO and CADGENBENCH_DATA_GT_REPO are already set
(chunk 5), and HF_TOKEN is the existing Space secret, so this rebuild
verifies the end-to-end Hub-only path inside the production runtime.

Dockerfile

@@ -44,7 +44,7 @@ RUN pip install --no-cache-dir playwright \
 
 # cadgenbench from the Public GitHub repo, pinned to a commit. Bumping
 # CADGENBENCH_SHA is the one-line path to picking up a new cadgenbench.
-ARG CADGENBENCH_SHA=36ac6b4
+ARG CADGENBENCH_SHA=1747493
 RUN pip install --no-cache-dir \
         "cadgenbench @ git+https://github.com/huggingface/cadgenbench.git@${CADGENBENCH_SHA}"