Merge pull request #6325 from uutils/renovate/cpp-0.x

fix(deps): update rust crate cpp to 0.5.9

src/uu/stdbuf/src/libstdbuf/Cargo.toml

@@ -20,7 +20,7 @@ crate-type = [
 ] # XXX: note: the rlib is just to prevent Cargo from spitting out a warning
 
 [dependencies]
-cpp = "0.5"
+cpp = "0.5.9"
 libc = { workspace = true }
 
 [build-dependencies]