Bump nvidia/cuda from 12.6.3-base-ubi8 to 12.8.0-base-ubi8 in /rhel8

Bumps nvidia/cuda from 12.6.3-base-ubi8 to 12.8.0-base-ubi8.

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

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

Author: dependabot[bot]

rhel8/Dockerfile

@@ -1,4 +1,4 @@
-FROM nvcr.io/nvidia/cuda:12.6.3-base-ubi8 as build
+FROM nvcr.io/nvidia/cuda:12.8.0-base-ubi8 as build
 
 ARG TARGETARCH
 ARG GOLANG_VERSION
@@ -21,7 +21,7 @@ RUN git clone https://github.com/NVIDIA/gpu-driver-container driver && \
     go build -o vgpu-util && \
     mv vgpu-util /work
 
-FROM nvcr.io/nvidia/cuda:12.6.3-base-ubi8
+FROM nvcr.io/nvidia/cuda:12.8.0-base-ubi8
 
 ARG TARGETARCH
 ENV TARGETARCH=$TARGETARCH