Prevent Cargo from trying to update swh-graph's dependencies

The --locked option forces Cargo to use the lockfile declared by swh-graph, which was carefully written to avoid conflicts between two Arrow versions that are used as transitive dependencies through different packages.

When Cargo tries to update one, it ends up with incompatible versions, causing a compilation failure.

Jenkins job jenkins-tools/swh-jenkins-dockerfiles #775 succeeded in 4 min 2 sec.
See Console Output, Blue Ocean and Coverage Report for more details.

approved this merge request

Makes sense, I guess this is why the docker images used by jenkins currently fail to build (https://jenkins.softwareheritage.org/job/jenkins-tools/job/swh-jenkins-dockerfiles/779/console).

it is

merged

mentioned in merge request swh/devel/swh-provenance!186 (merged)