BLD: Bump lower bound for meson-python

Since the mechanism for editable installations
was improved in mesonbuild/meson-python#569
and subsequently released in meson-python
v0.16.0, this bumps the minimum version for it
for use during compilation.

pyproject.toml

@@ -7,7 +7,7 @@
 [build-system]
 build-backend = "mesonpy"
 requires = [
-    "meson-python>=0.15.0",
+    "meson-python>=0.16.0",
     "Cython>=3.0.4",
 
     # numpy requirement for wheel builds for distribution on PyPI - building