Bump phpcompatibility/phpcompatibility-wp from 2.1.4 to 2.1.6

Bumps [phpcompatibility/phpcompatibility-wp](https://github.com/PHPCompatibility/PHPCompatibilityWP) from 2.1.4 to 2.1.6.
- [Release notes](https://github.com/PHPCompatibility/PHPCompatibilityWP/releases)
- [Commits](PHPCompatibility/PHPCompatibilityWP@2.1.4...2.1.6)

---
updated-dependencies:
- dependency-name: phpcompatibility/phpcompatibility-wp
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

composer.json

@@ -7,7 +7,7 @@
   },
   "require-dev": {
     "dealerdirect/phpcodesniffer-composer-installer": "1.0.0",
-    "phpcompatibility/phpcompatibility-wp": "2.1.4",
+    "phpcompatibility/phpcompatibility-wp": "2.1.6",
     "phpunit/phpunit": "9.5.28",
     "wp-coding-standards/wpcs": "^2.3",
     "johnpbloch/wordpress-core": "6.1.1",