chore(pack): untrack C2ME runtime cache

The previous commit accidentally captured cache/c2me-dfc (regenerated at runtime) and packwiz indexed it. Ignore cache/ and drop it from the index.

pack.toml

@@ -6,7 +6,7 @@ pack-format = "packwiz:1.1.0"
 [index]
 file = "index.toml"
 hash-format = "sha256"
-hash = "d3d88ba2a2d03f675ac0b0b252a06d8d29fe4741667c2d71c299c3c192e71f98"
+hash = "58620ee54b8b151aeb07b0fbbb1a6d6b373c0d6a43eda1f07b4b23cbcc9ec15f"
 
 [versions]
 minecraft = "1.21.1"