Update GHA

Author: streeve

.github/workflows/CI.yml

@@ -11,9 +11,12 @@ on:
 
 jobs:
   CI:
+    defaults:
+      run:
+        shell: bash
     strategy:
       matrix:
-        backend: ["OPENMP"]
+        backend: ["SERIAL","OPENMP"]
     runs-on: ubuntu-latest
     steps:
       - name: Install deps
@@ -22,7 +25,7 @@ jobs:
         uses: actions/checkout@v2.2.0
         with:
           repository: kokkos/kokkos
-          ref: 3.1.00
+          ref: 3.2.01
           path: kokkos
       - name: Build kokkos
         working-directory: kokkos