ci: update version of gfortran used

Author: everythingfunctional

.github/workflows/CI.yml

@@ -27,10 +27,10 @@ jobs:
 
     - name: Install GFortran, OpenCoarrays,and fpm
       run: |
-        sudo apt install -y gfortran-10 graphviz
-        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 100 \
-        --slave /usr/bin/gfortran gfortran /usr/bin/gfortran-10 \
-        --slave /usr/bingcov gcov /usr/bin/gcov-10
+        sudo apt install -y gfortran-11 graphviz
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-11 100 \
+        --slave /usr/bin/gfortran gfortran /usr/bin/gfortran-11 \
+        --slave /usr/bingcov gcov /usr/bin/gcov-11
         if [ ! -d OpenCoarrays-2.9.2 ] ; then wget -P . https://github.com/sourceryinstitute/OpenCoarrays/releases/download/2.9.2/OpenCoarrays-2.9.2.tar.gz && tar -xf OpenCoarrays-2.9.2.tar.gz && cd OpenCoarrays-2.9.2 && TERM=xterm ./install.sh -y; fi
         wget https://github.com/fortran-lang/fpm/releases/download/v0.1.3/fpm-0.1.3-linux-x86_64 && sudo cp fpm-0.1.3-linux-x86_64 /usr/local/bin/fpm && sudo chmod a+x /usr/local/bin/fpm