update windows-2019 to windows-2022

The windows-2019 runner image has been retired.

Signed-off-by: Michael Warres <mpw@google.com>

Author: mpwarres

.github/workflows/test.yml

@@ -129,7 +129,7 @@ jobs:
           flags: --config=clang-tsan
         - name: 'NullVM on Windows/x86_64'
           engine: 'null'
-          os: windows-2019
+          os: windows-2022
           arch: x86_64
           action: test
           targets: -//test/fuzz/...