Use VS2019 for TensorFlow pipeline
diff --git a/buildkite/pipelines/tensorflow-postsubmit.yml b/buildkite/pipelines/tensorflow-postsubmit.yml
index 44f617f..ed480f6 100644
--- a/buildkite/pipelines/tensorflow-postsubmit.yml
+++ b/buildkite/pipelines/tensorflow-postsubmit.yml
@@ -48,7 +48,7 @@
     environment:
       TF_IGNORE_MAX_BAZEL_VERSION: 1
       USE_BAZEL_VERSION: latest
-      BAZEL_VC: "C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\BuildTools\\VC"
+      BAZEL_VC: "C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\BuildTools\\VC"
     batch_commands:
     - echo.| python ./configure.py
     build_flags: