composer(deps): bump justinrainbow/json-schema from 5.2.11 to 5.2.12

Bumps [justinrainbow/json-schema](https://github.com/justinrainbow/json-schema) from 5.2.11 to 5.2.12.
- [Release notes](https://github.com/justinrainbow/json-schema/releases)
- [Commits](justinrainbow/json-schema@5.2.11...5.2.12)

---
updated-dependencies:
- dependency-name: justinrainbow/json-schema
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -24,7 +24,7 @@
     "ergebnis/json-pointer": "^3.1.0",
     "ergebnis/json-printer": "^3.2.0",
     "ergebnis/json-schema-validator": "^3.1.0",
-    "justinrainbow/json-schema": "^5.2.11"
+    "justinrainbow/json-schema": "^5.2.12"
   },
   "require-dev": {
     "ergebnis/data-provider": "^1.2.0",