Retry event upload 256 times on Windows

This remedies an issue (buildbuddy-io/buildbuddy#4467) where the
build would fail eventually because the connections to the remote get closed intermittently.

.bazelrc.common

@@ -64,6 +64,10 @@ build:ci-common --experimental_repository_cache_hardlinks
 
 # Use a remote cache during CI
 build:ci-windows-bindist --bes_upload_mode=wait_for_upload_complete --bes_timeout=60s
+# On Github CI for Windows, we see intermittent connection failures to BuildBuddy
+# (see https://github.com/buildbuddy-io/buildbuddy/issues/4467)
+# increase the retries as a workaround.
+build:ci-windows-bindist --experimental_build_event_upload_max_retries=256
 build:remote-cache --remote_cache=grpcs://remote.buildbuddy.io
 build:ci-common --remote_timeout=3600
 # Avoid failures of the form `deadline exceeded after 14999958197ns DEADLINE_EXCEEDED`.