use rustic_core from workspace

Author: aawsome

crates/testing/Cargo.toml

@@ -15,7 +15,7 @@ anyhow = { workspace = true }
 bytes = { workspace = true }
 enum-map = { workspace = true }
 once_cell = "1.19.0"
-rustic_core = "0.3.0"
+rustic_core = { workspace = true }
 tempfile = { workspace = true }
 
 [lints]