chore: prepare release v9.0.0-rc.5

[Antreesy]

v9.0.0-rc.5

What's Changed

💥 Breaking Changes

• The usernameToColor function is named exported instead of a default export.
  This was done to have consistent export types.

🐛 Fixed bugs

• perf(NcAvatar): ensure avatar does not add mutation observer #7157 (ShGKme)
• refactor(NcButton): remove redundant style #7154 (skjnldsv)
• fix(NcInputField): remove browser injected clear button #7167 (susnux)
• fix(NcModal): use --border-radius-container #7176 (susnux)
• fix(useIsDarkTheme): provide default value to silence runtime warnings #7185 (susnux)
• fix(NcAppSidebar): remove slot styling for buttons in the description #7182 (susnux)

Other Changes

• chore(NcAppSidebar): correctly define and document exposed CSS variables #5861 (ShGKme)
• chore: add current Node (upcoming) LTS 24.0.0 to supported engines #7163 (susnux)
• refactor(functions): Make sure only named exports are used (usernameToColor) #7161 (susnux)
• chore(NcRichText): remove unused remark plugin #7172 (susnux)
• refactor(NcRichText): migrate helpers to Typescript #7173 (susnux)
• refactor(NcRichText): use debounce instead of custom delay function #7174 (susnux)
• refactor: replace deprecated CSS variables and legacy fallbacks #7177 (susnux)
• refactor: use Typescript for l10n dummy import #7171 (susnux)

Full Changelog: v9.0.0-rc.4...v9.0.0-rc.5