Use auto for implementation type that is deprecated for 2.8

2 jobs for feature/modernize-some-parts-to-cpp14 in 3 minutes and 21 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Test
passed #228823
duneci
debian:10--clang

00:03:21

passed #228822
duneci
debian:10--gcc

00:02:53