[SECURITY] Fedora 34 Update: matrix-synapse-1.48.0-1.fc34

Matrix is an ambitious new ecosystem for open federated Instant Messaging and VoIP. Synapse is a reference “homeserver” implementation of Matrix from the core development team at matrix.org, written in Python/Twisted. It is intended to showcase the concept of Matrix and let folks see the spec in the context of a coded base and let you run your own homeserver and generally help bootstrap the ecosystem.