Fix check-ins not being sent and other improvements

Added

• Add reported_by tag to errors reported by the legacy error backend. This makes it easier to understand whether an error is being reported by the error backend.
• Set the app revision config option for Scalingo deploys automatically. If the CONTAINER_VERSION system environment variable is present, it will use used to set the revision config option automatically. Overwrite it's value by configuring the revision config option for your application.

Changed

• Change the primary download mirror for integrations.

Fixed

• Fix parentheses warning for Tesla on Elixir 1.17.x.

• Fix an issue where, after a certain amount of time, check-ins would no longer be sent.

  This issue also caused the default Hackney connection pool to be saturated, affecting other code that uses the default Hackney connection pool.

View the Elixir package v2.13.1 changelog for more information.