Merge branch 'feature/dune.module-2.8.0' into 'releases/2.8'

Use 2.8.0 in dune.module

See merge request !323
11 jobs for v2.8.0 in 37 minutes and 53 seconds (queued for 2 minutes and 26 seconds)
latest
Status Name Job ID Coverage
  Test
passed debian:10 clang-7-libcpp-17 #269369
duneci

00:11:19

passed debian:10 gcc-7-17 #269365
duneci

00:09:26

passed debian:10 gcc-8-noassert-17 #269368
duneci

00:17:07

passed debian:11 gcc-10-20 #269373
duneci

00:11:20

passed debian:11 gcc-9-20 #269371
duneci

00:11:10

passed ubuntu-20.04-gcc-9-17-python #269379
duneci

00:15:17

passed ubuntu:18.04 clang-5-17 #269374
duneci

00:14:01

passed ubuntu:18.04 clang-6-17 #269375
duneci

00:09:00

passed ubuntu:20.04 clang-10-20 #269378
duneci

00:11:44

passed ubuntu:20.04 gcc-10-20 #269377
duneci

00:15:05

passed ubuntu:20.04 gcc-9-20 #269376
duneci

00:16:07