update to ubuntu-22.04

Author: sumneko

.github/workflows/build.yml

@@ -24,8 +24,8 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - { os: ubuntu-20.04,   target: linux,   platform: linux-x64    }
-          - { os: ubuntu-20.04,   target: linux,   platform: linux-arm64  }
+          - { os: ubuntu-22.04,   target: linux,   platform: linux-x64    }
+          - { os: ubuntu-22.04,   target: linux,   platform: linux-arm64  }
           - { os: macos-latest,   target: darwin,  platform: darwin-x64   }
           - { os: macos-latest,   target: darwin,  platform: darwin-arm64 }
           #- { os: windows-latest, target: windows, platform: win32-ia32   } # 不再支持32位