chore: add github sponsor

EXPENSE_POLICY.md

@@ -1,7 +1,8 @@
 # Expense Policy
 
 Fastify collaborators accept donations through the [Open Collective](https://opencollective.com/fastify/)
-platform to enhance the project and support the community.
+platform and [GitHub Sponsors](https://github.com/sponsors/fastify)
+to enhance the project and support the community.
 
 This Collective is run by and for the benefit of the independent contributors to
 the Fastify open source software project.

SPONSORS.md

@@ -4,7 +4,8 @@ All active sponsors of Fastify are listed here, in order of contribution!
 Our sponsors are the reason why we can work on some issues or features
 that otherwise would be impossible to do.
 
-If you want to become a sponsor, please check out our [Open Collective page](https://opencollective.com/fastify).
+If you want to become a sponsor, please check out our [Open Collective page](https://opencollective.com/fastify)
+or [GitHub Sponsors](https://github.com/sponsors/fastify)!
 
 ## Tier 4
 

package.json

@@ -146,6 +146,16 @@
     "type": "opencollective",
     "url": "https://opencollective.com/fastify"
   },
+  "funding": [
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/fastify"
+    },
+    {
+      "type": "opencollective",
+      "url": "https://opencollective.com/fastify"
+    }
+  ],
   "devDependencies": {
     "@fastify/pre-commit": "^2.0.2",
     "@sinclair/typebox": "^0.31.17",