Remove unnecessary docs install command

Author: dmadison

.github/workflows/docs.yml

@@ -31,7 +31,6 @@ jobs:
           wget -q https://www.doxygen.nl/files/doxygen-${{ env.DOXYGEN_VERSION }}.linux.bin.tar.gz
           tar -xf doxygen-${{ env.DOXYGEN_VERSION }}.linux.bin.tar.gz
           cd doxygen-${{ env.DOXYGEN_VERSION }} && sudo make install
-          sudo apt-get install libclang1-9 libclang-cpp9
 
       - name: Install Themes
         env: