gossip-memory: bump indexmap to 2.12

Signed-off-by: Yuki Kishimoto <[email protected]>

Author: yukibtc

gossip/nostr-gossip-memory/Cargo.toml

@@ -12,7 +12,7 @@ rust-version.workspace = true
 keywords = ["nostr", "gossip", "in-memory"]
 
 [dependencies]
-indexmap = "2.11"
+indexmap = "2.12"
 lru.workspace = true
 nostr = { workspace = true, features = ["std"] }
 nostr-gossip.workspace = true