Fix the molecule run as part of CI process (#166)

* Updating CI Job;
* Changing gpg rpm key;

.github/workflows/telegraf.yml

@@ -22,7 +22,7 @@ on:
       - '.github/workflows/telegraf.yml'
 jobs:
   molecule:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
@@ -45,10 +45,10 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v1
 
-      - name: Set up Python 3.7
+      - name: Set up Python 3.9
         uses: actions/setup-python@v1
         with:
-          python-version: 3.7
+          python-version: 3.9
 
       - name: Install dependencies
         run: |