build: fix newline at end of file in build_util.yml

Ensure the update-tinyuf2 file path is correctly formatted by adding a newline at the end of the file.

Signed-off-by: ChihoSin [email protected]

Author: chihosin

.github/workflows/build_util.yml

@@ -93,4 +93,4 @@ jobs:
         with:
           files: |
             tinyuf2-${{ matrix.board }}-*.zip
-            update-tinyuf2-${{ matrix.board }}-${{ github.event.release.tag_name }}.uf2
+            update-tinyuf2-${{ matrix.board }}-${{ github.event.release.tag_name }}.uf2