Windows: Attempt to fix Unicode encoding error using chcp

UnicodeEncodeError: 'charmap' codec can't encode character '\u2192' in position 65: character maps to <undefined>

.github/workflows/main.yml

@@ -41,7 +41,9 @@ jobs:
 
       - name: Test
         shell: bash
-        run: python -m xmlrunner discover -v -o test-results/test/
+        run: |
+          chcp 65001 # Set code page to utf-8.
+          python -m xmlrunner discover -v -o test-results/test/
 
       - name: Pycodestyle
         run: pycodestyle cr8