fix(deps): update dependency apache-arrow to v21 (#579)

Co-authored-by: Leah E. Cole <[email protected]>

Author: renovate-bot

package.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "@google-cloud/paginator": "^6.0.0",
     "@google-cloud/precise-date": "^5.0.0",
-    "apache-arrow": "^19.0.1",
+    "apache-arrow": "^21.0.0",
     "core-js": "^3.41.0",
     "extend": "^3.0.2",
     "google-auth-library": "^10.0.0",