audit: Ignore h2 advisory (#158)

#### Problem

There's an audit failure on the repo due to the h2 advisory.

#### Summary of changes

Since there's no impact on this repo, just ignore until we can update to
agave dependencies with updated deps.

Author: joncinque

Makefile

@@ -28,6 +28,7 @@ audit:
 			--ignore RUSTSEC-2026-0098 \
 			--ignore RUSTSEC-2026-0099 \
 			--ignore RUSTSEC-2026-0104 \
+			--ignore RUSTSEC-2026-0258 \
 			$(ARGS)
 
 spellcheck: