build: bump version to 0.8.13

Author: scsibug

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "nostr-rs-relay"
-version = "0.8.12"
+version = "0.8.13"
 edition = "2021"
 authors = ["Greg Heartsfield <[email protected]>"]
 description = "A relay implementation for the Nostr protocol"