This patch version reverts the earlier fixes from Synapse 1.55.1, which could cause problems in certain deployments, and instead adds a cap to the version of Jinja to be installed. Again, this is to fix an incompatibility with version 3.1.0 of the Jinja library, and again, deployments of Synapse using the matrixdotorg/synapse
Docker image or Debian packages from packages.matrix.org are not affected.