MFH: r542468 r544604 r545291 r549046

net-im/py-matrix-synapse: update to 1.17.0

PR: 248016
Submitted by: Sascha Biberhofer <ports@skyforge.at> (maintainer)

net-im/py-matrix-synapse: Update to 1.18.0

PR: 248566
Submitted by: Sascha Biberhofer <ports@skyforge.at> (maintainer)

net-im/py-matrix-synapse: Update to 1.19.0

PR: 248719
Submitted by: Sascha Biberhofer <ports@skyforge.at> (maintainer)

net-im/py-matrix-synapse: Update to 1.19.3

Changelog: https://github.com/matrix-org/synapse/blob/v1.19.3/CHANGES.md

PR: 249375
Submitted by: Sascha Biberhofer <ports@skyforge.at> (maintainer)
Event: September 2020 Bugathon

Approved by: ports-secteam (fluffy)