Scriptworker

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Changed
~~~~~~~
- Updated ``ed25519_public_keys`` with new public keys

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Changed
~~~~~~~
- Updated ``ignore_keys`` to include the coming ``projectId``.
- Updated tests to use ``iscript>=5``

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Added
~~~~~
- Added a ``requirements.txt`` with unpinned requirements, for ronin-puppet pinning.

Changed
~~~~~~~
- Updated ``ignore_keys`` to include the coming ``taskQueueId``.

Fixed
~~~~~
- Removed esr68 prod cot tests

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Fixed
~~~~~
- Allowed for empty ``committer`` and ``author`` in github ``commit_data``

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Added
~~~~~
- Added cot restricted scopes for mobile github tasks

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Added
~~~~~
- Added ``semaphore_wrapper`` to easily use a semaphore for async coroutines.
- Added ``context.download_semaphore`` to share a download semaphore.
- Added ``max_concurrent_downloads`` pref, defaulting to 5.

Fixed
~~~~~
- Fixed 4-part versions.

Removed
~~~~~~~
- CoT support for ``application-services`` as cleanup effort
- Removed ``aiohttp_max_connections`` in favor of ``max_concurrent_downloads``.