* commit '53d7680e3':
Update synapse/storage/data_stores/main/devices.py
rename get_devices_by_remote to get_device_updates_by_remote
black
apply changes as a result of PR review
don't error if federation query doesn't have cross-signing keys
move get_e2e_cross_signing_key to EndToEndKeyWorkerStore so it works with workers
black
vendor-prefix the EDU name until MSC1756 is merged into the spec
fix unit test
add news file
update to work with newer code, and fix formatting
add missing param
make black happy
don't crash if the user doesn't have cross-signing keys
implement federation parts of cross-signing