automation: Update matrix-synapse Docker tag to v1.45.1

This MR contains the following updates:

Package	Update	Change
matrix-synapse	patch	1.45.0 -> 1.45.1

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Release Notes

matrix-org/synapse

v1.45.1

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Bugfixes

• Revert change to counting of deactivated users towards the monthly active users limit, introduced in 1.45.0rc1. (#​11127)

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