Bump nvidia/cuda in /base

Bumps nvidia/cuda from 12.6.2-base-ubuntu20.04 to 12.6.3-base-ubuntu20.04.

---
updated-dependencies:
- dependency-name: nvidia/cuda
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

base/Dockerfile

@@ -1,5 +1,5 @@
 # Ubuntu 22.04
-FROM nvcr.io/nvidia/cuda:12.6.2-base-ubuntu22.04 as jammy
+FROM nvcr.io/nvidia/cuda:12.6.3-base-ubuntu22.04 as jammy
 
 SHELL ["/bin/bash", "-c"]
 
@@ -34,7 +34,7 @@ RUN chmod +x /usr/local/bin/generate-ci-config && \
 ENTRYPOINT ["/usr/bin/sleep","1000"]
 
 # Ubuntu 20.04
-FROM nvcr.io/nvidia/cuda:12.6.2-base-ubuntu20.04 as focal
+FROM nvcr.io/nvidia/cuda:12.6.3-base-ubuntu20.04 as focal
 
 SHELL ["/bin/bash", "-c"]