Chore: add the local dune dep in the opam file to try to fix the test_opam_test job

2 jobs for v2.71.10 in 1 minute and 17 seconds (queued for 2 seconds)
latest
Name Stage Failure
failed
build Build
The following command needs to be run through "sudo":
apt-get install -qq -yy libgmp-dev libipc-system-simple-perl libmpfr-dev libstring-shellquote-perl perl pkg-config
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/g/glib2.0/libglib2.0-0_2.56.4-0ubuntu0.18.04.6_amd64.deb 404 Not Found [IP: 91.189.88.142 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/g/glib2.0/libglib2.0-data_2.56.4-0ubuntu0.18.04.6_all.deb 404 Not Found [IP: 91.189.88.142 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/libx/libxml2/libxml2_2.9.4+dfsg1-6.1ubuntu1.3_amd64.deb 404 Not Found [IP: 91.189.88.142 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
OS package installation failed
Cleaning up file based variables
ERROR: Job failed: exit code 1