automation: Update matrix-synapse Docker tag to v1.102.0

This MR contains the following updates:

Package	Update	Change
matrix-synapse (source)	minor	1.101.0 -> 1.102.0

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Release Notes

element-hq/synapse (matrix-synapse)

v1.102.0

Compare Source

Bugfixes

• Revert https://github.com/element-hq/synapse/pull/16756, which caused incorrect notification counts on mobile clients since v1.100.0. (#​16979)

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