Argh. Try a different flag.

Change-Id: Ia0f1f6aaeae035d27caa479c68e4293855dfeb9e
Reviewed-on: https://code-review.googlesource.com/c/re2/+/44218
Reviewed-by: Paul Wankadia <junyer@google.com>
diff --git a/kokoro/bazel.sh b/kokoro/bazel.sh
index 9c79ca8..1406e92 100755
--- a/kokoro/bazel.sh
+++ b/kokoro/bazel.sh
@@ -5,7 +5,7 @@
 
 case "${KOKORO_JOB_NAME}" in
   */windows-*)
-    choco upgrade bazel -y -f
+    choco upgrade bazel -y -i
     ;;
   *)
     # Use the script provided by Kokoro.