Bump barman to 3.20.0 and regenerate the sidecar's pip lockfile with the
same Python 3.13 used by the sidecar's venv.
barman 3.20.0 dropped fake-gcs-server support
(EnterpriseDB/barman#1218), so the GCS backup/restore and
replica-cluster e2e specs are skipped at runtime until that's fixed
upstream.
Also bundles tar into the sidecar image: barman 3.20.0's restore path
now shells out to it, and the distroless base doesn't ship it.
Signed-off-by: Tao Li <tao.li@enterprisedb.com>
Signed-off-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com>
Co-authored-by: Marco Nenciarini <marco.nenciarini@enterprisedb.com>
