Remove reference to Windows 2019 and temporarily increase timeout to validate build

Author: raulcd

.github/workflows/csharp.yml

@@ -73,7 +73,7 @@ jobs:
         run: ci/scripts/csharp_test.sh $(pwd)
 
   windows:
-    name: AMD64 Windows 2019 18.04 C# ${{ matrix.dotnet }}
+    name: AMD64 Windows C# ${{ matrix.dotnet }}
     runs-on: windows-2022
     if: ${{ !contains(github.event.pull_request.title, 'WIP') }}
     timeout-minutes: 15

dev/tasks/tasks.yml

@@ -632,6 +632,7 @@ tasks:
       env:
         PYARROW_TEST_GDB: "OFF"
       script: "verify-release-candidate.bat"
+      timeout: 120
 
 ############################## Docker tests ##################################