[infra] missing await (#1951)

follow up to #1950 

### Change Type

- [ ] `patch` — Bug fix
- [ ] `minor` — New feature
- [ ] `major` — Breaking change
- [ ] `dependencies` — Changes to package dependencies[^1]
- [ ] `documentation` — Changes to the documentation only[^2]
- [ ] `tests` — Changes to any test code only[^2]
- [x] `internal` — Any other changes that don't affect the published
package[^2]
- [ ] I don't know

[^1]: publishes a `patch` release, for devDependencies use `internal`
[^2]: will not publish a new version

scripts/lib/publishing.ts

@@ -131,7 +131,7 @@ export async function publish() {
 			async () => {
 				let output = ''
 				try {
-					exec(
+					await exec(
 						`yarn`,
 						[
 							'npm',