Log Message:
chat/matrix-synapse: Update to 1.105.0

Upstream NEWS summary:

# Features

  - Stabilize support for
    [MSC4010](https://github.com/matrix-org/matrix-spec-proposals/pull/4010)
    which clarifies the interaction of push rules and account
    data. Contributed by
    @clokep. ([\#17022](https://github.com/element-hq/synapse/issues/17022))

  - Stabilize support for
    [MSC3981](https://github.com/matrix-org/matrix-spec-proposals/pull/3981):
    `/relations` recursion. Contributed by
    @clokep. ([\#17023](https://github.com/element-hq/synapse/issues/17023))

  - Add support for moving `/pushrules` off of main
    process. ([\#17037](https://github.com/element-hq/synapse/issues/17037),
    [\#17038](https://github.com/element-hq/synapse/issues/17038))