fix(deps): update dependency google/analytics-data to ^0.21.0 (#9)

Author: renovate-bot

google-analytics-data/composer.json

@@ -1,6 +1,6 @@
 {
  "require": {
- "google/analytics-data": "^0.20.0"
+ "google/analytics-data": "^0.21.0"
  },
  "require-dev": {
  "google/cloud-tools": "dev-main",

google-analytics-data/quickstart_oauth2/composer.json

@@ -1,6 +1,6 @@
 {
  "require": {
- "google/analytics-data": "^0.20.0",
+ "google/analytics-data": "^0.21.0",
  "ext-bcmath": "*"
  }
 }