Make windows tests actually run on windows

Author: ianfixes

Diff for: .github/workflows/windows.yaml

@@ -5,7 +5,7 @@ on: [pull_request]
 
 jobs:
   "unittest_lint_sampleproject":
-    runs-on: ubuntu-latest
+    runs-on: windows-2019
     steps:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1
@@ -23,7 +23,7 @@ jobs:
           bundle exec arduino_ci.rb
 
   NetworkLib:
-    runs-on: ubuntu-latest
+    runs-on: windows-2019
     steps:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1