Update dependency MarkupSafe to v2.1.5

[balena-renovate]

This PR contains the following updates:

Package	Update	Change
MarkupSafe (changelog)	minor	==2.0.1 -> ==2.1.5

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Release Notes

pallets/markupsafe (MarkupSafe)

v2.1.5

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Released 2024-02-02

• Fix striptags not collapsing spaces. :issue:417

v2.1.4

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Released 2024-01-19

• Don't use regular expressions for striptags, avoiding a performance
  issue. :pr:413

v2.1.3

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Released 2023-06-02

• Implement format_map, casefold, removeprefix, and removesuffix
  methods. :issue:370
• Fix static typing for basic str methods on Markup. :issue:358
• Use Self for annotating return types. :pr:379

v2.1.2

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Released 2023-01-17

• Fix striptags not stripping tags containing newlines.
  :issue:310

v2.1.1

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Released 2022-03-14

• Avoid ambiguous regex matches in striptags. :pr:293

v2.1.0

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Released 2022-02-17

• Drop support for Python 3.6. :pr:262
• Remove soft_unicode, which was previously deprecated. Use
  soft_str instead. :pr:261
• Raise error on missing single placeholder during string
  interpolation. :issue:225
• Disable speedups module for GraalPython. :issue:277

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