Adding additional matrix param for both os's and excluding invalid co…

…mbinations.

.github/workflows/capgen_unit_tests.yaml

@@ -7,10 +7,20 @@ on:
 
 jobs:
   unit_tests:
-    runs-on: ubuntu-latest
     strategy:
       matrix:
-        fortran-compiler: [gfortran-9, gfortran-10, gfortran-11, gfortran-12, gfortran-13]
+        os: [ ubuntu-22.04, ubuntu-24.04 ]
+        fortran-compiler: [ gfortran-9, gfortran-10, gfortran-11, gfortran-12, gfortran-13, gfortran-14 ]
+        exclude:
+          os: ubuntu-24.04
+          fortran-compiler: gfortran-9
+          os: ubuntu-24.04
+          fortran-compiler: gfortran-10
+          os: ubuntu-24.04
+          fortran-compiler: gfortran-11
+          os: ubuntu-22.04
+          fortran-compiler: gfortran-14
+    runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v3
     - name: update repos and install dependencies