Bump external/fmt from `fac60bd` to `d498754`

[dependabot[bot]]

Bumps external/fmt from fac60bd to d498754.

Commits

• d498754 Add an experimental nested formatter
• 5bdce18 Mark styled_arg as a view to prevent lifetime issues
• a4b7b24 fix redundant redeclaration of ‘constexpr’ static data member (#3630)
• See full diff in compare view

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Dependabot will merge this PR once CI passes on it, as requested by @Idhrendur.

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[Idhrendur]

@dependabot squash and merge