net-im/py-matrix-synapse: Update to 1.61.1

This minor update contains a security fix for GHSA-22p3-qrh9-cx32 /
CVE-2022-31052.

While we're at it, switch to pypi as package source. This not only
follows general python port guidelines but also eliminates the
need for poetry2setup, hopefully fixing #264178[0].

Changes: https://github.com/matrix-org/synapse/releases/tag/v1.61.1

Signed-off-by: Sascha Biberhofer <sascha.biberhofer@skyforge.at>
PR: 264178
MFH: 2022Q2
Security: 07c0d782-f758-11ec-acaa-901b0e9408dc
Security: CVE-2022-31052