Remove version constraint.

--- matplotlib-3.10.3/pyproject.toml	2025-05-08 19:45:22.000000000 +0100
+++ matplotlib-3.10.3/pyproject.toml	2025-06-23 12:59:22.726604621 +0100
@@ -47,7 +47,7 @@
 [project.optional-dependencies]
 # Should be a copy of the build dependencies below.
 dev = [
-    "meson-python>=0.13.1,<0.17.0",
+    "meson-python>=0.13.1",
     "pybind11>=2.13.2,!=2.13.3",
     "setuptools_scm>=7",
     # Not required by us but setuptools_scm without a version, cso _if_
@@ -71,7 +71,7 @@
 build-backend = "mesonpy"
 # Also keep in sync with optional dependencies above.
 requires = [
-    "meson-python>=0.13.1,<0.17.0",
+    "meson-python>=0.13.1",
     "pybind11>=2.13.2,!=2.13.3",
     "setuptools_scm>=7",
 ]