Remove sudo from gem install fpm

.github/workflows/release.yml

@@ -29,7 +29,7 @@ jobs:
     - name: Build binary
       run: pyinstaller gotify-tray.spec
     - name: Install fpm
-      run: sudo gem install fpm
+      run: gem install fpm
     - name: Build Debian package
       run: |
         mkdir -p build/linux/opt