Bump privdrop from 0.5.5 to 0.5.6

---
updated-dependencies:
- dependency-name: privdrop
  dependency-version: 0.5.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -59,7 +59,7 @@ tokio = { version = "1.45.0", features = [
 toml = "0.8.22"
 
 [target.'cfg(target_family = "unix")'.dependencies]
-privdrop = "0.5.5"
+privdrop = "0.5.6"
 
 [dependencies.prometheus]
 optional = true