Use windows-latest agents in localization pipeline (microsoft#5538)

The loc pipeline uses windows-2019 agents that are being deprecated.
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Author: florelis

azure-pipelines.loc.yml

@@ -15,7 +15,7 @@ name: $(BuildDefinitionName)_$(date:yyMM).$(date:dd)$(rev:rrr)
 jobs:
 - job: Localize
   pool:
-    vmImage: windows-2019
+    vmImage: windows-latest
   variables:
     skipComponentGovernanceDetection: true
     tdbuildTeamId: 8343