Bump td from d961806 to 53acb2b

Bumps [td](https://github.com/tdlib/td) from `d961806` to `53acb2b`.
- [Commits](tdlib/td@d961806...53acb2b)

---
updated-dependencies:
- dependency-name: td
  dependency-type: direct:production
...

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