fix(types): correct rootDir in tsconfig.json

It looks like the default `rootDir` was `"."`, but for some reason,
adding the `src/version.js` file changed the `rootDir` to `"./src/"`.

Fixes: 9a42e3c
Fixes: #803

tsconfig.json

@@ -19,6 +19,7 @@
     // next to the .js files
     // We can't use `dist/` as Vite will automatically overwrite it.
     "outDir": "dist-types",
+    "rootDir": ".",
     // go to js file when using IDE functions like
     // "Go to Definition" in VSCode
     "declarationMap": true,