Update php-http/curl-client requirement from ^1.7 to ^1.7 || ^2.0

Updates the requirements on [php-http/curl-client](/~https://github.com/php-http/curl-client) to permit the latest version.
- [Release notes](/~https://github.com/php-http/curl-client/releases)
- [Changelog](/~https://github.com/php-http/curl-client/blob/master/CHANGELOG.md)
- [Commits](php-http/curl-client@v1.7.0...2.2.1)

---
updated-dependencies:
- dependency-name: php-http/curl-client
  dependency-type: direct:development
...

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

composer.json

@@ -22,7 +22,7 @@
     },
     "require-dev": {
         "geocoder-php/provider-integration-tests": "^1.0",
-        "php-http/curl-client": "^1.7",
+        "php-http/curl-client": "^1.7 || ^2.0",
         "php-http/message": "^1.0",
         "phpunit/phpunit": "^6.5 || ^7.5"
     },