Upgrade rust/crates/protobuf-codegen to 2.22.1

Test: make
Change-Id: Ib964aed5462ba84bba67f2dec07b2ff127ae63c2
diff --git a/src/code_writer.rs b/src/code_writer.rs
index 8b53bc6..f6d4c07 100644
--- a/src/code_writer.rs
+++ b/src/code_writer.rs
@@ -58,7 +58,7 @@
         self.write_line("#![allow(clippy::all)]");
         self.write_line("");
         self.write_line("#![allow(unused_attributes)]");
-        self.write_line("#![rustfmt::skip]");
+        self.write_line("#![cfg_attr(rustfmt, rustfmt::skip)]");
         self.write_line("");
         self.write_line("#![allow(box_pointers)]");
         self.write_line("#![allow(dead_code)]");