chore(deps): Update mediatype requirement from 0.20 to 0.21

---
updated-dependencies:
- dependency-name: mediatype
  dependency-version: 0.21.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.toml

@@ -8,4 +8,4 @@ resolver = "2"
 
 [workspace.dependencies]
 axum = { version = "0.8", default-features = false }
-mediatype = "0.20"
+mediatype = "0.21"