update windows release job to windows-2019

Summary:
The Windows release job was failing on GitHub because VC++ was too
old. Upgrade the image to windows-2019 to match the regular GitHub
Actions CI.

Reviewed By: fanzeyi, kmancini

Differential Revision: D34588409

fbshipit-source-id: 16fe7776a4cd8abf3dafc81c8584dba6d0811428

.github/workflows/release.yml

@@ -77,7 +77,7 @@ jobs:
   windows-build:
     continue-on-error: true
     needs: prepare
-    runs-on: windows-2016
+    runs-on: windows-2019
     steps:
     - uses: actions/checkout@v1
     - name: Export boost environment