Build bazel binary with .exe extension

This is required to make sure https://github.com/bazelbuild/continuous-integration/pull/850 works.

RELNOTES: None
PiperOrigin-RevId: 274759608
diff --git a/.bazelci/build_bazel_binaries.yml b/.bazelci/build_bazel_binaries.yml
index 0d58de5..28106ed 100644
--- a/.bazelci/build_bazel_binaries.yml
+++ b/.bazelci/build_bazel_binaries.yml
@@ -31,4 +31,4 @@
       - "-c"
       - "opt"
     build_targets:
-      - "//src:bazel"
+      - "//src:bazel.exe"