fix(deps): update dependency remark-lint-frontmatter-schema to v3.15.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
remark-lint-frontmatter-schema	3.15.2 -> 3.15.3

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Release Notes

JulianCataldo/remark-lint-frontmatter-schema (remark-lint-frontmatter-schema)

v3.15.3

Compare Source

Bug Fixes

• treat first yaml section as frontmatter, even if it is not the first child (c09c902)

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