build: run Windows CI only on nondeprecated build configurations

The windows-2016 runner has been deprecated on March 15, 2022. That is
why those runs are getting cancelled recently. This change fixes the
issue by removing that runner from the config.

Refs: https://github.blog/changelog/2021-10-19-github-actions-the-windows-2016-runner-image-will-be-removed-from-github-hosted-runners-on-march-15-2022
Signed-off-by: Darshan Sen <raisinten@gmail.com>

.github/workflows/ci-win.yml

@@ -10,7 +10,6 @@ jobs:
         node-version:  [10.x, 12.x, 14.x, 15.x, 16.x]
         os:
           - windows-2019
-          - windows-2016
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v2