fix: cyphera dependency 0.0.2-alpha.1 → 0.0.1-alpha.4

Earlier bump was wrong — the cyphera-rust SDK was published at
0.0.1-alpha.4 (alpha+1 from prior 0.0.1-alpha.3), not the assumed
minor bump. Picks up the schema rename and 2-arg-access error.

Author: lgutschow

Cargo.toml

@@ -19,7 +19,7 @@ pg_test = []
 
 [dependencies]
 pgrx = "0.13"
-cyphera = "0.0.2-alpha.1"
+cyphera = "0.0.1-alpha.4"
 serde_json = "1.0"
 once_cell = "1.19"
 hex = "0.4"