Update package version to 1.3.0

pkg.info

@@ -1,6 +1,6 @@
 name: python-build
 description: A simple, correct Python build frontend
-version: 1.2.2.post1
+version: 1.3.0
 revision: 1
 url: https://pypi.org/project/build/
 license: MIT
@@ -12,4 +12,11 @@ depends:
   - python-packaging
   - python-pyproject-hooks
 make_depends:
+  - python-build
   - python-flit-core
+  - python-installer
+downloads:
+  - url: https://github.com/pypa/build/archive/refs/tags/${BPM_PKG_VERSION}.tar.gz
+    extract_to: ${BPM_SOURCE}
+    extract_strip_components: 1
+    checksum: fd7a275d4b34e2b5b4c73fb57ae3c8239b54e4d09752eb540d4167c77bfa043d