Merge branch 'min-version' into 'master'

bump minimum required version of syncthing to 0.14.50

See merge request !2
6 jobs for master in 6 minutes and 17 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Build
passed #156898
build

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  Test
passed #156901
autopkgtest

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passed #156902
blhc

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passed #156900
lintian

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passed #156903
piuparts

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passed #156899
reprotest

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