Use filename to communicate nature of unused notarization output file

The project specific filename makes the file less suitable to be used as a "template" for application to any project.
Since this file is not used for anything, there is no need for it to have any special name.

Author: per1234

gon.config.hcl

@@ -10,5 +10,5 @@ sign {
 # Ask Gon for zip output to force notarization process to take place.
 # The CI will ignore the zip output, using the signed binary only.
 zip {
-  output_path = "arduino-lint.zip"
+  output_path = "unused.zip"
 }