update base image to pick any updates

[rahulait]

I was seeing older version of cuda-compat-13-2 in the cuda base image we are using. Doing "dnf update" pulls in newer version and also updates few packages which had CVEs in them. Example:

root@rahulsharm-dev1:~# docker run -it --entrypoint /bin/bash nvcr.io/nvidia/cuda:13.2.0-base-rockylinux9
Unable to find image 'nvcr.io/nvidia/cuda:13.2.0-base-rockylinux9' locally
13.2.0-base-rockylinux9: Pulling from nvidia/cuda
812c44127102: Already exists
8200543fc3d4: Pull complete
073e9408af9e: Pull complete
f36095593a69: Pull complete
5afc9d59efc0: Pull complete
314a2f652b6c: Pull complete
Digest: sha256:909fd18005d665a0204ab8cc9b05e2e8cde00970521e6e8052c45bb6deededf9
Status: Downloaded newer image for nvcr.io/nvidia/cuda:13.2.0-base-rockylinux9
bash-5.1# dnf update -y
cuda                                                           34 MB/s | 4.2 MB     00:00
Rocky Linux 9 - BaseOS                                        6.9 MB/s |  17 MB     00:02
Rocky Linux 9 - AppStream                                     7.6 MB/s |  17 MB     00:02
Rocky Linux 9 - Extras                                        6.1 kB/s |  17 kB     00:02
Dependencies resolved.
==============================================================================================
 Package                   Architecture    Version                      Repository       Size
==============================================================================================
Upgrading:
 cuda-compat-13-2          x86_64          3:595.58.03-1.el9            cuda            100 M
 gnutls                    x86_64          3.8.3-10.el9_7               baseos          1.1 M
 libarchive                x86_64          3.5.3-7.el9_7                baseos          387 k
 python3                   x86_64          3.9.25-3.el9_7.1             baseos           26 k
 python3-libs              x86_64          3.9.25-3.el9_7.1             baseos          7.5 M
 tzdata                    noarch          2026a-1.el9_7                baseos          496 k

In this PR, I am running dnf update for base image used so that we get the base image updated as required before configuring the image further.

I also added dnf clean all to reduce size of intermediate layers.