configure: bump Meson to 1.9.0 for use with Rust

Meson 1.9.0 provides mixed linking of Rust and C objects.  As a side effect,
this also allows adding dependencies with "sources: ..." files to Rust crates
that use structured_sources().

It can also clean up up the meson.build files for Rust noticeably, but due
to an issue with doctests (see https://github.com/mesonbuild/meson/pull/14973)
that will have to wait for 1.9.1.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250908105005.2119297-3-pbonzini@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

python/scripts/vendor.py

@@ -41,8 +41,8 @@ def main() -> int:
     parser.parse_args()
 
     packages = {
-        "meson==1.8.1":
-        "374bbf71247e629475fc10b0bd2ef66fc418c2d8f4890572f74de0f97d0d42da",
+        "meson==1.9.0":
+        "45e51ddc41e37d961582d06e78c48e0f9039011587f3495c4d6b0781dad92357",
     }
 
     vendor_dir = Path(__file__, "..", "..", "wheels").resolve()