generate matrix of jobs in workflow Params, instead of UnitTesting

.github/workflows/UnitTesting.yml

@@ -3,10 +3,9 @@ name: Unit Testing
 on:
   workflow_call:
     inputs:
-      python_versions:
+      jobs:
         description: 'Space separated list of Python versions to run tests with.'
-        required: false
-        default: '3.6 3.7 3.8 3.9 3.10'
+        required: true
         type: string
       requirements:
         description: 'Python dependencies to be installed through pip.'
@@ -21,40 +20,14 @@ on:
 
 jobs:
 
-
-  Versions:
-    runs-on: ubuntu-latest
-    outputs:
-      jobs: ${{ steps.versions.outputs.jobs }}
-    steps:
-
-      - id: versions
-        shell: python
-        run: |
-          icons = {
-             '3.6': '🔴', # until 23.12.2021
-             '3.7': '🟠', # until 27.06.2023
-             '3.8': '🟡', # until Oct. 2024
-             '3.9': '🟢', # until Oct. 2025
-            '3.10': '🟢', # until Oct. 2026
-          }
-          jobs = [
-              {'python': version, 'icon': icons[version]}
-              for version in '${{ inputs.python_versions }}'.split(' ')
-          ]
-          print(f'::set-output name=jobs::{jobs!s}')
-
-
   UnitTesting:
     name: ${{ matrix.icon }} Unit Tests using Python ${{ matrix.python }}
     runs-on: ubuntu-latest
-    needs:
-      - Versions
 
     strategy:
       fail-fast: false
       matrix:
-        include: ${{ fromJson(needs.Versions.outputs.jobs) }}
+        include: ${{ fromJson(inputs.jobs) }}
 
     steps:
       - name: ⏬ Checkout repository