Update dependency mongodb/mongodb to ~1.21.0

| datasource | package         | from   | to     |
| ---------- | --------------- | ------ | ------ |
| packagist  | mongodb/mongodb | 1.20.0 | 1.21.1 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Diff for: composer.json

@@ -45,7 +45,7 @@
         "laminas/laminas-db": "^2.20.0",
         "laminas/laminas-http": "^2.20",
         "laminas/laminas-validator": "^2.64.1",
-        "mongodb/mongodb": "~1.20.0",
+        "mongodb/mongodb": "~1.21.0",
         "phpunit/phpunit": "^10.5.38",
         "psalm/plugin-phpunit": "^0.19.0",
         "vimeo/psalm": "^5.26.1"