Disable restic local caches

Local caches apparently require an exclusive lock, effectively
preventing concurrency -- it is still to be seen if the repository
lock has the same effect though.
3 jobs for master in 1 minute and 59 seconds
Status Job ID Name Coverage
  Build Src
passed #9155
build:src

00:00:17

 
  Build Pkg
passed #9156
build:pkg

00:01:14

 
  Upload
passed #9157
upload:pkg

00:00:26