net/syncthing: Format patches I missed before

In 3283046e4d19e44049dac619ac43802a7eb4e67a I overlooked the patch
provided by Anton Saietskii. His commit message would have been:

Update to 1.29.6

Since upstream commit 6a14709, minimum Go version is 1.23.

While here, pet portclippy/portfmt and disable ccache (as it doesn't
support Go, but still got installed, for example, in poudriere).

PR: 285838