[Build] Update Python and CMake requirements in Dockerfile and pyproject.toml

- Added CMake version requirement (>=3.26) to pyproject.toml for build compatibility.
- Created a Python 3.8 environment in the Dockerfile and added a symlink for easier access to the Python 3.8 executable.

Author: LeiWang1999

maint/scripts/pypi.Dockerfile

@@ -28,10 +28,12 @@ RUN conda tos accept --override-channels --channel https://repo.anaconda.com/pkg
 
 # Create environments
 RUN set -eux; \
+    conda create -n py38 python=3.8 -y; \
     conda create -n py39 python=3.9 -y; \
     conda create -n py310 python=3.10 -y; \
     conda create -n py311 python=3.11 -y; \
     conda create -n py312 python=3.12 -y; \
+    ln -s /miniconda3/envs/py38/bin/python3.8 /usr/bin/python3.8; \
     ln -s /miniconda3/envs/py39/bin/python3.9 /usr/bin/python3.9; \
     ln -s /miniconda3/envs/py310/bin/python3.10 /usr/bin/python3.10; \
     ln -s /miniconda3/envs/py311/bin/python3.11 /usr/bin/python3.11; \

pyproject.toml

@@ -1,6 +1,7 @@
 [build-system]
 requires = [
     "build",
+    "cmake>=3.26",
     "packaging",
     "setuptools>=61",
     "wheel",