Update sponsor-image workflow

scripts/sponsors/generate-sponsor-image.sh

@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 
-npm install
+npm install sponsorkit@0.6.1
 npx sponsorkit -o ../../website/static/img/

scripts/sponsors/package-lock.json

@@ -1424,7 +1424,7 @@
     },
     "node_modules/sponsorkit": {
       "version": "0.6.1",
-      "resolved": "https://registry.npmmirror.com/sponsorkit/-/sponsorkit-0.6.1.tgz",
+      "resolved": "https://registry.npmjs.org/sponsorkit/-/sponsorkit-0.6.1.tgz",
       "integrity": "sha512-KPctw94EI/n/ynCC1GNUYOcXyHDV3C7pnbH9fRHc7LuME4KDMLJCzKC+DsNHH684nyKRNQKU41v5BCfZPjfw+w==",
       "dependencies": {
         "consola": "^2.15.3",
@@ -1440,6 +1440,9 @@
       },
       "bin": {
         "sponsorkit": "bin/sponsorkit.js"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
       }
     },
     "node_modules/sshpk": {