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loader_git: Decrease concurrency to tentatively decrease oom kill events

Related to T3474

Test Plan

octodiff is fine:

$ bin/octocatalog-diff --octocatalog-diff-args --no-truncate-details --to staging worker01
...
*** Running octocatalog-diff on host worker01.softwareheritage.org
I, [2021-08-10T12:41:14.800506 #3240]  INFO -- : Catalogs compiled for worker01.softwareheritage.org
I, [2021-08-10T12:41:16.519275 #3240]  INFO -- : Diffs computed for worker01.softwareheritage.org
diff origin/production/worker01.softwareheritage.org current/worker01.softwareheritage.org
*******************************************
  File[/etc/systemd/system/swh-worker@loader_git.service.d/parameters.conf] =>
   parameters =>
     content =>
      @@ -3,5 +3,5 @@
      _
       [Service]
      -Environment=CONCURRENCY=6
      +Environment=CONCURRENCY=5
       Environment=MAX_TASKS_PER_CHILD=100
       Environment=LOGLEVEL=info
*******************************************
  Systemd::Dropin_file[swh-worker@loader_git/parameters.conf] =>
   parameters =>
     content =>
      @@ -3,5 +3,5 @@
      _
       [Service]
      -Environment=CONCURRENCY=6
      +Environment=CONCURRENCY=5
       Environment=MAX_TASKS_PER_CHILD=100
       Environment=LOGLEVEL=info
*******************************************
*** End octocatalog-diff on worker01.softwareheritage.org

Migrated from D6074 (view on Phabricator)

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