CI: Ignore RUSTSEC-2021-0145 since it only affects benchmarks.

See the issue linked in audit.toml for more info.

.cargo/audit.toml

@@ -1,5 +1,13 @@
 [advisories]
-ignore = []
+ignore = [
+    # criterion.rs is a benchmark-only dependency.
+    # https://github.com/bheisler/criterion.rs/issues/629
+    # Dependency tree:
+    # atty 0.2.14
+    # └── criterion 0.4.0
+    #     └── ring 0.17.0-not-released-yet
+    "RUSTSEC-2021-0145",
+]
 
 [output]
 deny = ["warnings", "yanked", "unsound", "unmaintained"]