Fix typo

Author: Patricia Aas

.github/workflows/configure_qt.yml

@@ -121,7 +121,7 @@ jobs:
         if: startsWith(matrix.config.os, 'ubuntu-20.04')
         shell: bash
         run: |
-            sudo alt-get install clang
+            sudo apt-get install clang
   #        sudo apt-get install clang clang-11 clang-tools-11 clang-11-doc libclang-common-11-dev libclang-11-dev libclang1-11 clang-format-11 clangd-11
   #        sudo apt-get install libc++ libc++-11-dev libc++abi-11-dev