Bumps [deps/zlib](https://github.com/madler/zlib) from `53ce271` to `21767c6`.
- [Release notes](https://github.com/madler/zlib/releases)
- [Commits](53ce271311...21767c654d
)
---
updated-dependencies:
- dependency-name: deps/zlib
dependency-type: direct:production
...
Signed-off-by: dependabot[bot] <support@github.com>