Update docker.io/syncthing/syncthing Docker tag to v1.29.1

This MR contains the following updates:

Package	Update	Change
docker.io/syncthing/syncthing (source)	minor	1.28.1 -> 1.29.1

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Release Notes

syncthing/syncthing (docker.io/syncthing/syncthing)

v1.29.1

Compare Source

v1.29.1

Bugfixes:

• #​9904: The browse API response has changed as of Syncthing v1.29.0
• #​9906: Deadlocks randomly, occasionally
• #​9907: The response of "pending" APIs has changed as of Syncthing v1.29.0
• #​9909: Login into UI (Browser) not working anymore

v1.29.0

Compare Source

v1.29.0

Bugfixes:

• #​9855: GUI address unix socket broken
• #​9872: When socket files are in a folder that needs to be synced on linux, some files were not synced until the socket files were removed
• #​9875: Clarify log message for ignored folders

Other issues:

• #​9870: Fails with Go 1.24: runtime go1.24rc1 not found in compat.yaml

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