Use 2019 image for pypy.

Author: ionelmc

.appveyor.yml

@@ -27,7 +27,7 @@ matrix:
       TOXENV: 'py38-pytest46-xdist133-coverage55,py38-pytest54-xdist133-coverage55,py38-pytest62-xdist202-coverage55'
     - image: Visual Studio 2015
       TOXENV: 'py39-pytest62-xdist202-coverage55'
-    - image: Visual Studio 2019
+    - image: Visual Studio 2015
       TOXENV: 'pypy-pytest46-xdist127-coverage55'
     - image: Visual Studio 2015
       TOXENV: 'pypy3-pytest46-xdist127-coverage55,pypy3-pytest46-xdist133-coverage55,pypy3-pytest54-xdist133-coverage55,pypy3-pytest62-xdist202-coverage55'

ci/templates/.appveyor.yml

@@ -26,7 +26,7 @@ matrix:
       TOXENV: '{{ py38_environments|join(",") }}'
     - image: Visual Studio 2015
       TOXENV: '{{ py39_environments|join(",") }}'
-    - image: Visual Studio 2019
+    - image: Visual Studio 2015
       TOXENV: '{{ pypy_environments|join(",") }}'
     - image: Visual Studio 2015
       TOXENV: '{{ pypy3_environments|join(",") }}'