Build(deps): Bump json_schemer from 0.2.20 to 0.2.21 (#16667)

Bumps [json_schemer](https://github.com/davishmcclurg/json_schemer) from 0.2.20 to 0.2.21.
- [Release notes](https://github.com/davishmcclurg/json_schemer/releases)
- [Commits](https://github.com/davishmcclurg/json_schemer/compare/v0.2.20...v0.2.21)

---
updated-dependencies:
- dependency-name: json_schemer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -190,7 +190,7 @@ GEM
     json (2.6.1)
     json-schema (2.8.1)
       addressable (>= 2.4)
-    json_schemer (0.2.20)
+    json_schemer (0.2.21)
       ecma-re-validator (~> 0.3)
       hana (~> 1.3)
       regexp_parser (~> 2.0)