Update dependency rich to v15

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
rich	>=14.2,<15.0 → >=15,<15.1

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Release Notes

Textualize/rich (rich)

v15.0.0

Compare Source

Changed

• Breaking change: Dropped support for Python3.8

Fixed

• Fixed empty print ignoring the end parameter #​4075
• Fixed Text.from_ansi removing newlines #​4076
• Fixed FileProxy.isatty not proxying #​4077
• Fixed inline code in Markdown tables cells #​4079

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