Bump svelte from 3.6.10 to 3.21.0

Bumps [svelte](https://github.com/sveltejs/svelte) from 3.6.10 to 3.21.0.
- [Release notes](https://github.com/sveltejs/svelte/releases)
- [Changelog](https://github.com/sveltejs/svelte/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sveltejs/svelte/compare/v3.6.10...v3.21.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package-lock.json

@@ -144,9 +144,9 @@
       "dev": true
     },
     "svelte": {
-      "version": "3.6.10",
-      "resolved": "https://registry.npmjs.org/svelte/-/svelte-3.6.10.tgz",
-      "integrity": "sha512-2N9kIbDal5z/aZloaRCOQ9dlCtuCE08NZITDlSdG7fOl4kFrE2qnXCq+lSFtI15ABWCXPc17cX5vJvdOgUsKqw==",
+      "version": "3.21.0",
+      "resolved": "https://registry.npmjs.org/svelte/-/svelte-3.21.0.tgz",
+      "integrity": "sha512-smh3LZKPCGJ+UXa0iZvUmuDctPYCwPY1opmClTWTm+l6e4y9FHLoCZMiue8YIeyc9JvlGT/EK0xry0diXjFDZQ==",
       "dev": true
     }
   }

package.json

@@ -3,6 +3,6 @@
     "rollup": "^1.17.0",
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-svelte": "^5.1.1",
-    "svelte": "^3.6.10"
+    "svelte": "^3.21.0"
   }
 }