[CI] Update RAPIDS to latest stable (dmlc#9464)

* [CI] Update RAPIDS to latest stable

* [CI] Use CMake 3.26.4

---------

Co-authored-by: hcho3 <[email protected]>
Co-authored-by: Hyunsu Philip Cho <[email protected]>

Author: github-actions[bot]

tests/buildkite/conftest.sh

@@ -24,7 +24,7 @@ set -x
 
 CUDA_VERSION=11.8.0
 NCCL_VERSION=2.16.5-1
-RAPIDS_VERSION=23.06
+RAPIDS_VERSION=23.08
 SPARK_VERSION=3.4.0
 JDK_VERSION=8
 

tests/ci_build/Dockerfile.gpu_build_centos7

@@ -17,8 +17,8 @@ RUN \
     bash conda.sh -b -p /opt/mambaforge && \
     /opt/mambaforge/bin/python -m pip install awscli && \
     # CMake
-    wget -nv -nc https://cmake.org/files/v3.24/cmake-3.24.0-linux-x86_64.sh --no-check-certificate && \
-    bash cmake-3.24.0-linux-x86_64.sh --skip-license --prefix=/usr
+    wget -nv -nc https://cmake.org/files/v3.26/cmake-3.26.4-linux-x86_64.sh --no-check-certificate && \
+    bash cmake-3.26.4-linux-x86_64.sh --skip-license --prefix=/usr
 
 # NCCL2 (License: https://docs.nvidia.com/deeplearning/sdk/nccl-sla/index.html)
 RUN \