[Python/Wheel] Adjust minimum CMake version

Set the minimum CMake version to 3.27 so that we can use upper-cased or
lower-cased *_ROOT variables to identify the locations of dependencies.
We also set the HDF5_ROOT CMake variable so that HighFive can find HDF5.

interfaces/python_sdist/CMakeLists.txt

@@ -1,4 +1,7 @@
-cmake_minimum_required(VERSION 3.24...3.30)
+# Set minimum version 3.27 so that CMP0144, search for packages by upper-cased
+# environment variables will use upper-cased variables. OLD behavior is to ignore
+# upper-cased variables
+cmake_minimum_required(VERSION 3.27...3.31)
 project(${SKBUILD_PROJECT_NAME} LANGUAGES CXX)
 
 set(CMAKE_CXX_STANDARD 17)

interfaces/python_sdist/pyproject.toml.in

@@ -75,6 +75,7 @@ make-fallback = false
 [tool.scikit-build.cmake.define]
 CMAKE_POSITION_INDEPENDENT_CODE = "ON"
 Boost_INCLUDE_DIRS = { env = "Boost_INCLUDE_DIRS" }
+HDF5_ROOT = { env = "HDF5_ROOT" }
 
 [tool.scikit-build.sdist]
 exclude = ["pyproject.toml.in", "cantera/with_units/solution.py.in"]