Onboard kevr as project maintainer

Fix #438 (closed)

roles/matrix/tasks/main.yml

@@ -77,7 +77,7 @@
 - name: install synapse
   pip:
     name:
-      - 'matrix-synapse[postgres,systemd,url_preview,redis,oidc]==1.47.1'
+      - 'matrix-synapse[postgres,systemd,url_preview,redis,oidc]==1.48.0'
     state: latest
     extra_args: '--upgrade-strategy=eager'
     virtualenv: /var/lib/synapse/venv