chg: ci: Use default cloning depth for the Danger CI job

With shallow fetching working reliably in pygit2 1.17.0+, there is no
longer any need for GitLab CI runners to clone the BIND 9 repository
with a fixed depth of 1000 during every "danger" CI job as Hazard is now
able to fetch remote refs with an arbitrary depth, controlled by the
HAZARD_FETCH_DEPTH environment variable.  The latter can be defined via
GitLab project's CI settings and adjusted as needed over time, without
the need to update .gitlab-ci.yml every time its value needs to be
changed.

Merge branch 'michal/use-default-cloning-depth-for-the-danger-ci-job' into 'main'

See merge request isc-projects/bind9!9946

.gitlab-ci.yml

@@ -615,11 +615,6 @@ shfmt:
 
 danger:
   <<: *precheck_job
-  # Keep the GIT_DEPTH environment variable set to a "high number" before
-  # https://github.com/libgit2/libgit2/pull/6662 is addressed and integrated
-  # into pygit2.
-  variables:
-    GIT_DEPTH: 1000
   needs: []
   script:
     - pip install git+https://gitlab.isc.org/isc-projects/hazard.git