Update dependency decorator to v5.1.0

This MR contains the following updates:

Package	Type	Update	Change
decorator	ironbank-pypi	minor	5.0.9 -> 5.1.0

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Release Notes

micheles/decorator

v5.1.0

Added a function decoratorx using the FunctionMaker and thus preserving the signature of __code__ objects. Then fixed three small bugs:

• Sphinx was printing a few warnings when building the documentation, as signaled by Tomasz Kłoczko
• functions decorated with decorator.contextmanager were one-shot, as discovered by Alex Pizarro.
• decorator.decorator was not passing the kwsyntax argument.

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