automation: Update matrix-synapse Docker tag to v1.87.0

This MR contains the following updates:

Package	Update	Change
matrix-synapse	minor	1.86.0 -> 1.87.0

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Release Notes

matrix-org/synapse (matrix-synapse)

v1.87.0

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Please note that this will be the last release of Synapse that is compatible with Python 3.7 and earlier. This is due to Python 3.7 now having reached End of Life; see our deprecation policy for more details.

Bugfixes

• Pin pydantic to ^1.7.4 to avoid backwards-incompatible API changes from the 2.0.0 release. Resolves https://github.com/matrix-org/synapse/issues/15858. Contributed by @​PaarthShah. (#​15862)

Internal Changes

• Split out 2022 changes from the changelog so the rendered version in GitHub doesn't timeout as much. (#​15846)

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