Update package version to 0.20.4

pkg.info

@@ -1,6 +1,6 @@
 name: blueprint-compiler
 description: Markup language and compiler for GTK 4 user interfaces
-version: 0.20.0
+version: 0.20.4
 revision: 1
 url: https://gnome.pages.gitlab.gnome.org/blueprint-compiler/
 license: LGPL3-or-later
@@ -18,4 +18,4 @@ downloads:
   - url: https://download.gnome.org/sources/blueprint-compiler/${BPM_PKG_VERSION%.*}/blueprint-compiler-${BPM_PKG_VERSION}.tar.xz
     extract_to: ${BPM_SOURCE}
     extract_strip_components: 1
-    checksum: ec786d66f583e8296c845f1f82834d27b369f39d55a6380b34880493e22db382
+    checksum: 1f1ecc84bcd698902d422f7de83d39229a209dd3016f6d2c3b0ed0ab123f6891