Bump rowan from 0.15.15 to 0.15.16

Bumps [rowan](https://github.com/rust-analyzer/rowan) from 0.15.15 to 0.15.16.
- [Commits](rust-analyzer/rowan@v0.15.15...v0.15.16)

---
updated-dependencies:
- dependency-name: rowan
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -7,5 +7,5 @@ edition = "2021"
 anyhow = "1.0.86"
 log = "0.4.22"
 rnix = "0.11.0"
-rowan = "0.15.15"
+rowan = "0.15.16"
 serde = { version = "1.0.206", features = [ "derive" ] }