Extend tests to multiple versions and pin action versions (#50)

Author: kunaltyagi

.github/workflows/tests.yml

@@ -9,12 +9,15 @@ on:
 jobs:
   Run-tests:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
     steps:
-      - uses: actions/checkout@v3
-      - name: Set up Python 3.11
-        uses: actions/setup-python@v4
+      - uses: actions/checkout@v4.1.0
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4.7.1
         with:
-          python-version: 3.11
+          python-version: ${{ matrix.python-version }}
 
       - name: Run NSIQCppStyle tests
         timeout-minutes: 5