[changelog skip] Hatchet v7.0.0

[schneems]

• ActiveSupport's Object#blank? and Object#present? are no longer provided by default (https://github.com/heroku/hatchet/pull/107)
• Remove deprecated support for passing a block to App#run (https://github.com/heroku/hatchet/pull/105)
• Ignore 403 on app delete due to race condition (https://github.com/heroku/hatchet/pull/101)
• The hatchet.lock file can now be locked to "main" in addition to "master" (https://github.com/heroku/hatchet/pull/86)
• Allow concurrent one-off dyno runs with the run_multi: true flag on apps (https://github.com/heroku/hatchet/pull/94)
• Apps are now marked as being "finished" by enabling maintenance mode on them when teardown! is called. Finished apps can be reaped immediately (https://github.com/heroku/hatchet/pull/97)
• Applications that are not marked as "finished" will be allowed to live for a HATCHET_ALIVE_TTL_MINUTES duration before they're deleted by the reaper to protect against deleting an app mid-deploy, default is seven minutes (https://github.com/heroku/hatchet/pull/97)
• The HEROKU_APP_LIMIT env var no longer does anything, instead hatchet application reaping is manually executed if an app cannot be created (https://github.com/heroku/hatchet/pull/97)
• App#deploy without a block will no longer run teardown! automatically (https://github.com/heroku/hatchet/pull/97)
• Calls to git push heroku are now rate throttled (https://github.com/heroku/hatchet/pull/98)
• Calls to app.run are now rate throttled (https://github.com/heroku/hatchet/pull/99)
• Deployment now raises and error when the release failed (https://github.com/heroku/hatchet/pull/93)