CI: Update py_decl to 0.0.4.

Gives more detailed reports about firmware/flash size and overlap.

.github/workflows/micropython.yml

@@ -88,7 +88,7 @@ jobs:
       uses: actions/checkout@v4
       with:
         repository: gadgetoid/py_decl
-        ref: v0.0.1
+        ref: v0.0.4
         path: py_decl
 
     - name: Build MPY Cross