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":  "*"
     }
 }