Synapse 1.40.0rc2 (2021-08-04)

Bugfixes

• Fix the PeriodicallyFlushingMemoryHandler inhibiting application shutdown because of its background thread. (#10517)
• Fix a bug introduced in Synapse v1.40.0rc1 that could cause Synapse to respond with an error when clients would update read receipts. (#10531)

Internal Changes

• Fix release script to open the correct URL for the release. (#10516)