chore(deps): update dependency antsibull-docs to >=2.15,<2.16

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
antsibull-docs (changelog)	>=2.14,<2.15 -> >=2.15,<2.16

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Release Notes

ansible-community/antsibull-docs (antsibull-docs)

v2.15.0

Compare Source

Release Summary

Bugfix and feature release which migrates to Pydantic 2.

Minor Changes

• Migrated all models to Pydantic 2. This is mostly transparent, except that validation error messages slightly change, and that some validation is more strict. For example, if a boolean is used instead of a string, say in a description, this now results in an error instead of a silent coercion. Numbers are still accepted for strings (for example version_added with float values like 2.14) (#​331, ansible-community/antsibull-core#333, ansible-community/antsibull-core#344).
• This project now depends on antsibull-core >= 3.2.0 and pydantic 2 (#​330).
• Use Proxy configuration settings from the environment. Check out the aiohttp documentation on Proxy support for information on which environment variables are supported (ansible/ansible-documentation#1936, #​346).
• Use language ini for example INI code blocks (#​335).
• When rendering the Ansible docsite with the stable and devel subcommands, information on deprecated collections is shown (ansible-community/ansible-build-data#450, #​330).
• When rendering the Ansible docsite with the stable and devel subcommands, stub pages for removed collections are added (ansible-community/ansible-build-data#459, #​341).

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