chore(deps): update syncthing/syncthing docker tag to v1.28.1

[renovate]

This PR contains the following updates:

Package	Update	Change
syncthing/syncthing (source)	patch	1.28.0 -> 1.28.1

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Release Notes

syncthing/syncthing (syncthing/syncthing)

v1.28.1

Compare Source

Bugfixes:

• #​9400: Folder overlap not detected when using tilde
• #​9590: WebUI table column widths broken on iPhone 12 Pro Max and wider
• #​9686: Sync status stays at 'Syncing xx%" when remote device pauses the folder.
• #​9757: Firefox, dark theme: device ID is hard to read
• #​9775: Junctions as dirs doesn't work anymore
• #​9776: Disabled checkbox panels don't respect dark theme
• #​9783: gui: Address override not respected in fresh default config
• #​9821: panic: runtime error: index out of range [-1]

Enhancements:

• #​9725: Ignoring symbolic links when syncing on android as well

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