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

---

Release Notes

matrix-org/synapse

v1.87.0

Compare Source

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)

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this MR and you won't be reminded about this update again.

---

• If you want to rebase/retry this MR, check this box

---

This MR has been generated by Renovate Bot.