fix: Unblock dependency updates

- Guard null buffer in JSON scalar toString, which @apache-arrow/esnext-esm
  21.2.0 rejects (TS2345 on TextDecoder.decode)
- Drop redundant Promise.resolve return in sync, flagged by
  eslint-plugin-unicorn 72
- Hold typescript at <7 until typescript-eslint supports it

Author: erezrokah

.github/renovate.json5

@@ -1,3 +1,10 @@
 {
   extends: ["github>cloudquery/.github//.github/renovate-node-default.json5"],
+  packageRules: [
+    {
+      // typescript-eslint does not support TS 7 yet: https://github.com/typescript-eslint/typescript-eslint/issues/10940
+      matchPackageNames: ["typescript"],
+      allowedVersions: "<7",
+    },
+  ],
 }

src/scalar/json.ts

@@ -72,7 +72,7 @@ class JSONType implements Scalar<Nullable<Uint8Array>> {
   }
 
   public toString() {
-    if (this._valid) {
+    if (this._valid && this._value !== null) {
       return new TextDecoder().decode(this._value);
     }
 

src/scheduler/scheduler.ts

@@ -269,5 +269,4 @@ export const sync = async ({
   }
 
   stream.end();
-  return await Promise.resolve();
 };