Bump google/apiclient from 1.1.7 to 2.12.1

Bumps [google/apiclient](https://github.com/googleapis/google-api-php-client) from 1.1.7 to 2.12.1.
- [Release notes](https://github.com/googleapis/google-api-php-client/releases)
- [Commits](googleapis/google-api-php-client@1.1.7...v2.12.1)

---
updated-dependencies:
- dependency-name: google/apiclient
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

composer.json

@@ -1,6 +1,6 @@
 {
     "require": {
-        "google/apiclient": "1.1.7",
+        "google/apiclient": "2.12.1",
         "guzzlehttp/guzzle": "^5.3"
     }
 }