Deploy loader.core v5.8.1 (opam)

New version contains a fix for the opam loader regarding packages with missing metadata.

staging:

• (ongoing) swh-charts: Bump new version
• argocd: Deploy

production:

• static worker: Clean up opam root & reinit
• Update package loader
• Restart package loader
• Checks [1]

[1] It's now fine

root@pergamon:~# clush -b -w @swh-workers /usr/bin/opam show --color never --safe --normalise --root /tmp/opam/ xen-disk --field all-versions
---------------
worker[01-16] (16)
---------------
1.0.2  1.0.3  1.2.1

Jul 10 15:37:36 worker06 python3[1211898]: [2023-07-10 15:37:36,587: INFO/MainProcess] Received task: swh.lister.opam.tasks.OpamListerTask[05093577-d4ea-45a4-8099-687d1acf9fbb]
Jul 10 15:37:41 worker06 python3[1655985]: [opam.ocaml.org] no changes from https://opam.ocaml.org
Jul 10 15:38:44 worker06 python3[1564231]: [2023-07-10 15:38:44,178: INFO/ForkPoolWorker-7] Task swh.lister.opam.tasks.OpamListerTask[05093577-d4ea-45a4-8099-687d1acf9fbb] succeeded in 67.5507197920233s: {'pages': 4368, 'origins': 4368}