Bump mio from 0.8.10 to 0.8.11 in /server

Bumps [mio](https://github.com/tokio-rs/mio) from 0.8.10 to 0.8.11.
- [Release notes](https://github.com/tokio-rs/mio/releases)
- [Changelog](https://github.com/tokio-rs/mio/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tokio-rs/mio/compare/v0.8.10...v0.8.11)

---
updated-dependencies:
- dependency-name: mio
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

server/Cargo.lock

@@ -1092,9 +1092,9 @@ dependencies = [
 
 [[package]]
 name = "mio"
-version = "0.8.10"
+version = "0.8.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8f3d0b296e374a4e6f3c7b0a1f5a51d748a0d34c85e7dc48fc3fa9a87657fe09"
+checksum = "a4a650543ca06a924e8b371db273b2756685faae30f8487da1b56505a8f78b0c"
 dependencies = [
  "libc",
  "wasi 0.11.0+wasi-snapshot-preview1",