Update linux-builds.yml

Author: githubuser0xFFFF

.github/workflows/linux-builds.yml

@@ -11,7 +11,7 @@ jobs:
     - uses: actions/checkout@v1
     - name: install qt
       run: |
-        sudo apt-get update –fix-missing
+        sudo apt-get update --fix-missing
         sudo apt-get install qt5-default
     - name: qmake
       run: qmake