(docs deps): Bump remark-lint-no-file-name-mixed-case

Bumps [remark-lint-no-file-name-mixed-case](https://github.com/remarkjs/remark-lint/tree/HEAD/packages/remark-lint-no-file-name-mixed-case) from 2.1.1 to 2.1.2.
- [Release notes](https://github.com/remarkjs/remark-lint/releases)
- [Changelog](https://github.com/remarkjs/remark-lint/blob/main/changelog.md)
- [Commits](https://github.com/remarkjs/remark-lint/commits/HEAD/packages/remark-lint-no-file-name-mixed-case)

---
updated-dependencies:
- dependency-name: remark-lint-no-file-name-mixed-case
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -66,7 +66,7 @@
     "remark-lint-no-file-name-articles": "^2.1.2",
     "remark-lint-no-file-name-consecutive-dashes": "^2.1.1",
     "remark-lint-no-file-name-irregular-characters": "^2.1.2",
-    "remark-lint-no-file-name-mixed-case": "^2.1.1",
+    "remark-lint-no-file-name-mixed-case": "^2.1.2",
     "remark-lint-no-file-name-outer-dashes": "^2.1.2",
     "remark-lint-no-heading-content-indent": "^4.1.1",
     "remark-lint-no-heading-indent": "^4.1.2",