[FEATURE] Helper action to upgrade braindead windows in CI (- WIP #210 -)

Additions with file .github/actions/upgrade-windows-pip/action.yml:
 * new helper for Windows-specific pip upgrade step implemented as seperate action now.

Changes in file .github/workflows/Tests.yml:
 * simplify the config by using the new DRY action.

Author: reactive-firewall

.github/actions/upgrade-windows-pip/action.yml

@@ -0,0 +1,14 @@
+---
+name: 'Upgrade Windows Pip'
+description: 'Fixes Windows pip issues by upgrading'
+author: 'Mr. Walls'
+branding:
+  icon: 'chevron-up'
+  color: 'yellow'
+
+runs:
+  using: composite
+  steps:
+    - run: python -m pip install --upgrade pip
+      shell: bash
+      if: ${{ !cancelled() && runner.os == 'Windows' }}

.github/workflows/Tests.yml

@@ -91,8 +91,7 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
     - name: Fix braindead windows ${{ matrix.python-version }} on ${{ matrix.os }}
-      if: ${{ !cancelled() && runner.os == 'Windows' }}
-      run: python -m pip install --upgrade pip
+      uses: ./.github/actions/upgrade-windows-pip
     - name: Install dependencies for python ${{ matrix.python-version }} on ${{ matrix.os }}
       run: make -f Makefile test-reqs || true
     - name: Install code-climate tools for ${{ matrix.python-version }} on ${{ matrix.os }}