py-nanobind add cmake path (#40079)

* py-nanobind add cmake path

* fix style

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Co-authored-by: Robert Underwood <runderwood@anl.gov>

var/spack/repos/builtin/packages/py-nanobind/package.py

@@ -36,3 +36,8 @@ class PyNanobind(PythonPackage):
 
     depends_on("py-cmake@3.17:", type="build")
     depends_on("py-ninja", type="build")
+
+    @property
+    def cmake_prefix_paths(self):
+        paths = [join_path(self.prefix, self.spec["python"].package.platlib, "nanobind", "cmake")]
+        return paths