github: drop 1.16 from ci

Author: changkun

.github/workflows/hotkey.yml

@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        go: ['1.16.x', '1.17.x', '1.18.x', '1.19.x']
+        go: ['1.17.x', '1.18.x', '1.19.x']
     steps:
     - name: Install and run dependencies (xvfb libx11-dev)
       if: ${{ runner.os == 'Linux' }}