Use the build.targets setting name.

scikit-build-core renamed cmake.targets to build.targets in 0.10 and refuses
the old name outright. LIEF pins 0.9.8 in build-requirements.txt, but nothing
enforces that pin when the backend runs against the installed copy, so the
build fails with "Use build.targets instead of cmake.targets". The other
cmake.* settings used here were not renamed.

--- a/backend/setup.py
+++ b/backend/setup.py
@@ -106,7 +106,7 @@
         "wheel.py-api":  config.build.py_api,
         "cmake.source-dir": SRC_DIR.as_posix(),
         "cmake.build-type": config.build.build_type,
-        "cmake.targets": config.build.targets,
+        "build.targets": config.build.targets,
         "cmake.args": [
             *config.cmake_generator,
             *config.get_cmake_args(is_editable),