Applied suggestion from https://help.appveyor.com/discussions/problems/30239-postgres-fails-to-connect-after-version-change

Author: Bart Koelman

appveyor.yml

@@ -35,6 +35,8 @@ for:
     - image: Visual Studio 2019
   services:
   - postgresql134
+  init:
+  - net start postgresql-x64-13
   # REF: https://github.com/docascode/docfx-seed/blob/master/appveyor.yml
   before_build:
     - pwsh: |