ci: allow proc-macro-error for now

Author: Kijewski

deny.toml

@@ -1,4 +1,15 @@
 [licenses]
 version = 2
-allow = ["Apache-2.0", "BSD-2-Clause", "MIT", "Unicode-DFS-2016"]
+allow = ["Apache-2.0", "MIT", "Unicode-DFS-2016"]
 private = { ignore = true }
+
+[advisories]
+ignore = [
+    # `proc-macro-error` is unmaintained, but still used by `maud_macros`
+    "RUSTSEC-2024-0370",
+]
+
+[sources]
+allow-git = [
+    "https://github.com/rinja-rs/rinja",
+]