Update dependency keepachangelog to ^0.5.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
keepachangelog (source, changelog)	^0.3.1 -> ^0.5.0

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Release Notes

Colin-b/keepachangelog

v0.5.0

Compare Source

Added

• keepachangelog.release function to guess new version number based on Unreleased section, update changelog and return new version number.
• keepachangelog.to_raw_dict function returning a raw markdown description of the release under raw dict.

Fixed

• Handle any category name.
• Add more flexibility for release format.

Changed

• Unreleased is now reported as lower cased unreleased.

v0.4.0

Compare Source

Added

• keepachangelog.flask_restx.add_changelog_endpoint function to add a changelog endpoint to a Flask-RestX application.

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