cargo: exclude tests/fuzz from the package

I missed more binary test data `tests/fuzz/` in rust-lang#1281, which should
remove another 56KiB from the regex crate.

PR rust-lang#1289

Author: erickt

Cargo.toml

@@ -13,7 +13,7 @@ finite automata and guarantees linear time matching on all inputs.
 """
 categories = ["text-processing"]
 autotests = false
-exclude = ["/fuzz/*", "/record/*", "/scripts/*", "/.github/*"]
+exclude = ["/fuzz/*", "/record/*", "/scripts/*", "tests/fuzz/*", "/.github/*"]
 edition = "2021"
 rust-version = "1.65"