Build error against Numpy 2.x

[ametzler]

Numpy support breaks with numpy 2.0. The cmake test fails:

-- Found Python: /usr/bin/python3 (found version "3.13.1") found components: Interpreter
-- Checking for threading support:   std::thread
--     (added compiler flags: -pthread
-- Could NOT find Python (missing: Python_INCLUDE_DIRS Python_LIBRARIES Python_NumPy_INCLUDE_DIRS Interpreter Development NumPy Development.Module Development.Embed) 
-- Checking VIGRANUMPY_DEPENDENCIES
-- Could NOT find Python (missing: Python_INCLUDE_DIRS Python_LIBRARIES Python_NumPy_INCLUDE_DIRS Interpreter Development NumPy Development.Module Development.Embed) 
-- Python not found. Make sure that Python is in your PATH or set the appropriate variables as described in https://cmake.org/cmake/help/latest/module/FindPython.html

[ametzler]

This is https://bugs.debian.org/1094371
I have managed to work around the cmake issue with

-DPython_NumPy_INCLUDE_DIR=$(shell pkgconf --variable=includedir numpy)

However I still get a testsuite error:
ts-error.txt
(sphinx also crashes)