Update fs-err requirement from 2 to 3 (#98)

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tools/codegen/Cargo.toml

@@ -3,7 +3,7 @@ name = "futures-async-stream-internal-codegen"
 edition = "2021"
 
 [dependencies]
-fs-err = "2"
+fs-err = "3"
 globset = { version = "0.4", default-features = false }
 prettyplease = "0.2"
 proc-macro2 = { version = "1", default-features = false }