Remove periods from copyright headers (#5046)

changelog.d/5046.misc

synapse/api/constants.py

synapse/api/errors.py

synapse/api/urls.py

synapse/config/saml2_config.py

synapse/crypto/keyring.py

synapse/events/spamcheck.py

synapse/rest/media/v1/_base.py

synapse/rest/well_known.py

synapse/util/async_helpers.py

tests/crypto/test_keyring.py

tests/util/test_linearizer.py