Fixing snapcraft command deprecation

Author: NickGeek

.github/workflows/release.yml

@@ -80,7 +80,7 @@ jobs:
           SNAPCRAFT_STORE_CREDENTIALS: ${{ secrets.SNAPCRAFT_TOKEN }}
         run: |
           sudo snap install snapcraft --classic
-          snapcraft push "dist/micropad_$(npm pkg get version | sed 's/"//g')_amd64.snap" --release candidate
+          snapcraft upload "dist/micropad_$(npm pkg get version | sed 's/"//g')_amd64.snap" --release candidate
 
   package-macos:
     needs: [prepare-posix]