try to fix pippo binary name under windows

.github/workflows/release.yml

@@ -44,7 +44,7 @@ jobs:
         with:
           # (required) Comma-separated list of binary names (non-extension portion of filename) to build and upload.
           # Note that glob pattern is not supported yet.
-          bin: pippo
+          bin: pippo,pippo.exe
           # (optional) Target triple, default is host triple.
           # This is optional but it is recommended that this always be set to
           # clarify which target you are building for if macOS is included in