Bump @graphql-tools/batch-execute from 9.0.6 to 9.0.8

Bumps [@graphql-tools/batch-execute](https://github.com/graphql-hive/gateway/tree/HEAD/packages/batch-execute) from 9.0.6 to 9.0.8.
- [Release notes](https://github.com/graphql-hive/gateway/releases)
- [Changelog](https://github.com/graphql-hive/gateway/blob/main/packages/batch-execute/CHANGELOG.md)
- [Commits](https://github.com/graphql-hive/gateway/commits/@graphql-tools/[email protected]/packages/batch-execute)

---
updated-dependencies:
- dependency-name: "@graphql-tools/batch-execute"
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>