Update composer/semver requirement from ^1.4 to ^2.0

Updates the requirements on [composer/semver](https://github.com/composer/semver) to permit the latest version.
- [Release notes](https://github.com/composer/semver/releases)
- [Changelog](https://github.com/composer/semver/blob/master/CHANGELOG.md)
- [Commits](composer/semver@1.4.0...2.0.0)

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

Author: dependabot-preview[bot]

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "composer/semver": "^1.4",
+        "composer/semver": "^2.0",
         "wp-cli/wp-cli": "^2.4"
     },
     "require-dev": {