Update dependency nelmio/api-doc-bundle to v4.15.2

This MR contains the following updates:

Package	Type	Update	Change
nelmio/api-doc-bundle	require	patch	4.15.1 -> 4.15.2

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Release Notes

nelmio/NelmioApiDocBundle (nelmio/api-doc-bundle)

v4.15.2

Compare Source

What's Changed

• use string instead of constant by @​DjordyKoert in https://github.com/nelmio/NelmioApiDocBundle/pull/2174

Full Changelog: https://github.com/nelmio/NelmioApiDocBundle/compare/v4.15.1...v4.15.2

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