Auto merge of #18036 - Veykril:smol_str, r=Veykril

Bump `smol_str`

Author: bors

Cargo.lock

@@ -145,7 +145,7 @@ smallvec = { version = "1.10.0", features = [
   "union",
   "const_generics",
 ] }
-smol_str = "0.2.1"
+smol_str = "0.3.1"
 snap = "1.1.0"
 text-size = "1.1.1"
 tracing = "0.1.40"