Buildbots fail when new files are added

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2019-05-25.13:14:10.565>
labels = ['3.8', 'tests']
title = 'Buildbots fail when new files are added'
updated_at = <Date 2021-12-31.03:37:01.108>
user = 'https://github.com/jaraco'

bugs.python.org fields:

activity = <Date 2021-12-31.03:37:01.108>
actor = 'jaraco'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Tests']
creation = <Date 2019-05-25.13:14:10.565>
creator = 'jaraco'
dependencies = []
files = []
hgrepos = []
issue_num = 37043
keywords = []
message_count = 4.0
messages = ['343478', '343482', '343487', '409403']
nosy_count = 3.0
nosy_names = ['barry', 'jaraco', 'zach.ware']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue37043'
versions = ['Python 3.8']