Merge #17726: ci: Use python 3.7 on Windows Github Actions

fabd5b444e ci: Use python 3.7 on Windows Github Actions (MarcoFalke)

Pull request description:

  This mirrors the appveyor config 7da9e3a817/.appveyor.yml (L10) and is needed for PEP 540

ACKs for top commit:
  sipsorcery:
    tACK fabd5b444e.
  laanwj:
    ACK fabd5b444e

Tree-SHA512: 2d0118bf4eb5ec510d1ad6e287d35bf28cc800101fa18704c119c7bc84f545aaa236ffe45dc425559e6bd896610302a133b2c50ccdcd3ced6e4d6f8302de7cdb

.github/workflows/ci.yml

@@ -15,6 +15,10 @@ jobs:
     steps:
     - uses: actions/checkout@v1
 
+    - uses: actions/setup-python@v1
+      with:
+        python-version: '3.7'  # Needed for PEP 540
+
     - uses: actions/cache@v1
       id: vcpkgcache
       with:
@@ -67,10 +71,7 @@ jobs:
     - name: rpcauth-test
       shell: cmd
       run: python test\util\rpcauth-test.py
-# This step fails due to character UTF encoding error. If anyone knows how Python deals with Unicode they might be
-# able to decipher the error message.
-#    - name: test_runner
-#      shell: cmd
-#      run: |
-#       python test\functional\test_runner.py --ansi --ci --quiet --combinedlogslen=4000 --failfast --exclude feature_fee_estimation
-
+    - name: test_runner
+      shell: cmd
+      run: |
+       python test\functional\test_runner.py --ansi --ci --quiet --combinedlogslen=4000 --failfast --exclude feature_fee_estimation