I started to see this on MacOS Sonoma 14.3.1:
INFO: From PackageZip ...:
.../external/rules_pkg/pkg/private/zip/build_zip.runfiles/core/../rules_pkg/pkg/private/zip/build_zip.py:77: DeprecationWarning: datetime.datetime.utcfromtimestamp() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.fromtimestamp(timestamp, datetime.UTC).
ts = datetime.datetime.utcfromtimestamp(ts)
Might be related to a recent brew upgrade?