Upgrade Svelte to 4 (#4652)

* Upgrade Svelte to 4

* Update package.json

packages/@uppy/svelte/package.json

@@ -23,9 +23,9 @@
     "@tsconfig/svelte": "^3.0.0",
     "rollup": "^2.60.2",
     "rollup-plugin-svelte": "^7.0.0",
-    "svelte": "^3.31.0",
-    "svelte-check": "^2.0.0",
-    "svelte-preprocess": "^4.6.1"
+    "svelte": "^4.0.0",
+    "svelte-check": "^3.0.0",
+    "svelte-preprocess": "^5.0.0"
   },
   "peerDependencies": {
     "@uppy/core": "workspace:^",
@@ -33,7 +33,7 @@
     "@uppy/drag-drop": "workspace:^",
     "@uppy/progress-bar": "workspace:^",
     "@uppy/status-bar": "workspace:^",
-    "svelte": "^3.0.0"
+    "svelte": "^4.0.0"
   },
   "publishConfig": {
     "access": "public"