requirements: update sphinx-autodoc-typehints requirement from <1.15.0 to <1.16.0

[dependabot]

Updates the requirements on sphinx-autodoc-typehints to permit the latest version.

Changelog

Sourced from sphinx-autodoc-typehints's changelog.

1.15.1

• Fix fully_qualified should be typehints_fully_qualified

1.15.0

• Resolve type guard imports before evaluating annotations for objects
• Remove set_type_checking_flag flag as this is now done by default
• Fix crash when the inspect module returns an invalid python syntax source
• Made formatting function configurable using the option typehints_formatter

1.14.1

• Fixed normalize_source_lines() messing with the indentation of methods with decorators that have parameters starting with def.
• Handle ValueError or TypeError being raised when signature of an object cannot be determined
• Fix KeyError being thrown when argument is not documented (e.g. cls argument for class methods, and self for methods)

1.14.0

• Added typehints_defaults config option allowing to automatically annotate parameter defaults.

1.13.1

• Fixed NewType inserts a reference as first argument instead of a string

1.13.0

• Dropped Python 3.6 support
• Python 3.10 support
• Normalize async functions properly
• Allow py310 style annotations (PEP-563)

1.12.0

• Dropped Python 3.5 support
• Added the simplify_optional_unions config option (PR by tillhainbach)
• Fixed indentation of multiline strings (PR by Yuxin Wu)

1.11.1

• Changed formatting of None to point to the Python stdlib docs (PR by Dominic Davis-Foster)
• Updated special dataclass handling (PR by Lihu Ben-Ezri-Ravin)

1.11.0

• Dropped support for Sphinx < 3.0
• Added support for alternative parameter names (arg, argument, parameter)
• Fixed import path for Signature (PR by Matthew Treinish)

... (truncated)

Commits

• d770c69 Fix fully_qualified should be typehints_fully_qualified (#204)
• 87759d4 Release 1.15.0
• 27555dd Remove set_type_checking flag (#202)
• e2e780d Configurable formatter (#171)
• 91c9f86 Resolve type guard imports (#201)
• 1e25828 Fix crash when inspect moduel returns invalid Python code
• 6b86a6a Local methods are only troublesome for methods
• d5ed402 Remove extra space in warning
• d2d2d23 Simplify code for process signature
• b2f26ce Update CHANGELOG.md
• Additional commits viewable in compare view

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[github-actions]

This PR causes the following changes to the html docs (ubuntu-latest-3.7-x64):

diff -r docs-base/.buildinfo docs-head/.buildinfo
3c3
< config: 93a36d7daeeffc980fdbe13b5661e43b
---
> config: 2756124a1a258cfc1eedcf79d651812e

...

See CI logs for the full diff.

[jvesely]

@dependabot squash and merge