CI(deps): Update msys2/setup-msys2 action to v2.26.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
msys2/setup-msys2	action	minor	v2.25.0 -> v2.26.0

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Release Notes

msys2/setup-msys2 (msys2/setup-msys2)

v2.26.0

Compare Source

• Update base distribution to 20241208. [#​444]
• Update dependencies
• Update @​actions/cache to v4 which will be required for the GitHub cache
  backend migration, which is scheduled for 2025-02, https://github.com/actions/toolkit/discussions/1890ons/1890 for details. There is no
  action required for users of this action, but old versions of this action may
  start to fail after the legacy cache backend is sunset.

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Configuration

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