Updated the github actions checkout and setup-python to newer version…

…s and removed the no longer supported python versions.

.github/workflows/unit_tests.yml

@@ -29,12 +29,6 @@ jobs:
           - '3.1'
           - '3.2'
         include:
-          - python-version: '2.7'
-            h5py-version: '2.6'
-          - python-version: '2.7'
-            h5py-version: '2.10'
-          - python-version: '3.0'
-            h5py-version: '2.3'
           - python-version: '3.5'
             h5py-version: '2.6'
           - python-version: '3.5'
@@ -44,9 +38,9 @@ jobs:
           - python-version: '3.11'
             h5py-version: '3.10'
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install System Dependencies