Fix mercurial install on Windows

Author: coordt

.github/workflows/test.yaml

@@ -38,7 +38,7 @@ jobs:
         if: matrix.os == 'windows-latest'
         shell: powershell
         run: |
-          choco install mercurial --confirm
+          choco install hg --confirm
       - name: Check mercurial is working
         run: |
           echo -e '[ui]\nusername = Testing Mercurial<bumpversion-test-hg@github.actions>' > ~/.hgrc