Update package version to 4.0.0

pkg.info

@@ -1,9 +1,11 @@
 name: python-flit-core
 description: A PEP 517 build backend for packages using Flit
-version: 3.12.0
+version: 4.0.0
 revision: 1
 url: https://pypi.org/project/flit-core/
 license: BSD-3-Clause
+maintainers:
+  - [email protected]
 architecture: any
 output_architecture: any
 type: source
@@ -13,4 +15,4 @@ downloads:
   - url: https://github.com/pypa/flit/archive/refs/tags/${BPM_PKG_VERSION}.tar.gz
     extract_to: ${BPM_SOURCE}
     extract_strip_components: 1
-    checksum: c157ff92c01f4bb169182722ff76aadac113926b729215e91909021aa56e2ea3
+    checksum: eddb35521cd8e57410f947010f8fe6d08d158e2fc47626de039166e1b1e99358