[RHOAI-2.25][RHAIENG-2040] Update keras to 3.12.0

[atheo89]

Related to:

• [RHAIENG-2040] Update keras to 3.12.0 opendatahub-io/notebooks#2732
• https://issues.redhat.com/browse/RHAIENG-2040

Description

This PR backport changes from main to rhoai-2.25
git cherry-pick d43c829a5053d5faca1b6f355c932bc4bd69f73e e96d14bb2c9c4cbbb64ab09b6df3939ef297b779 640568b45b507b67a851f601817a8b78b79b2431

How Has This Been Tested?

Self checklist (all need to be checked):

• Ensure that you have run make test (gmake on macOS) before asking for review
• Changes to everything except Dockerfile.konflux files should be done in odh/notebooks and automatically synced to rhds/notebooks. For Konflux-specific changes, modify Dockerfile.konflux files directly in rhds/notebooks as these require special attention in the downstream repository and flow to the upcoming RHOAI release.

Merge criteria:

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[openshift-ci]

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