Update blinker requirement from <1.5,>=1.4 to >=1.4,<1.7 in /api

[dependabot]

Updates the requirements on blinker to permit the latest version.

Changelog

Sourced from blinker's changelog.

Version 1.6

Released 2023-04-02

• Add a muted context manager to temporarily turn off a signal. :pr:84
• Allow int senders (alongside existing string senders). :pr:83
• Add a send_async method to the Signal to allow signals to send to coroutine receivers. :pr:76
• Update and modernise the project structure to match that used by the pallets projects. :pr:77
• Add an intial set of type hints for the project.

Version 1.5

Released 2022-07-17

• Support Python >= 3.7 and PyPy. Python 2, Python < 3.7, and Jython may continue to work, but the next release will make incompatible changes.

Version 1.4

Released 2015-07-23

• Verified Python 3.4 support, no changes needed.
• Additional bookkeeping cleanup for non-ANY connections at disconnect time.
• Added Signal._cleanup_bookeeping() to prune stale bookkeeping on demand.

Version 1.3

Released 2013-07-03

• The global signal stash behind signal() is now backed by a regular name-to-Signal dictionary. Previously, weak references were held in the mapping and ephermal usage in code like signal('foo').connect(...) could have surprising program behavior depending on import order of modules.
• Namespace is now built on a regular dict. Use WeakNamespace for the older, weak-referencing behavior.
• Signal.connect('text-sender') uses an alterate hashing strategy to avoid sharp edges in text identity.

... (truncated)

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