Update Python version from 3.7 to 3.9 in CI/CD workflows

Co-authored-by: semarj <549538+semarj@users.noreply.github.com>

Author: Copilot

.github/workflows/CD.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install Python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.9
         if: ${{ steps.release.outputs.release_created }}
 
       - name: Install dependancies

.github/workflows/CI.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: [3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2
@@ -58,10 +58,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Set up Python 3.7
+      - name: Set up Python 3.9
         uses: actions/setup-python@v2
         with:
-          python-version: 3.7
+          python-version: 3.9
 
       - name: Install python dependencies
         run: |