fix(actions/desktop-release): fix ubuntu-20 to ubuntu-20.04

Author: GervinFung

.github/workflows/desktop.yaml

@@ -51,7 +51,7 @@ jobs:
               run: pnpm i
 
             - name: Install Ubuntu dependencies
-              if: matrix.config.os == 'ubuntu-20'
+              if: matrix.config.os == 'ubuntu-20.04'
               working-directory: apps/desktop
               run: make install-ubuntu-prerequisites