fast_float 6.1.5

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Created by brew bump

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Created with brew bump-formula-pr.

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release notes

## What's Changed
* documentation for issue 261 by @lemire in https://github.com/fastfloat/fast_float/pull/263
* remove out-of-line defns of constexpr static data members under c++17 by @yfeldblum in https://github.com/fastfloat/fast_float/pull/268
* Support aarch64-w64-mingw32 target by @eukarpov in https://github.com/fastfloat/fast_float/pull/269
New Contributors

@cclauss made their first contribution in Keep GitHub Actions up to date with GitHub's Dependabot fastfloat/fast_float#265
@dependabot made their first contribution in Bump the github-actions group with 3 updates fastfloat/fast_float#266
@yfeldblum made their first contribution in remove out-of-line defns of constexpr static data members under c++17 fastfloat/fast_float#268
@eukarpov made their first contribution in Support aarch64-w64-mingw32 target fastfloat/fast_float#269

Full Changelog: fastfloat/fast_float@v6.1.4...v6.1.5

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