fix: match PhD values in degree backfill

migrations/009_academic_degree_filter.sql

@@ -3,7 +3,7 @@ ADD COLUMN IF NOT EXISTS has_academic_degree BOOLEAN NOT NULL DEFAULT FALSE;
 
 UPDATE employees
 SET has_academic_degree = COALESCE(
-  current_data::text ~* '(кандидат|доктор).{0,80}наук|ph\\.?[[:space:]]*d\\.?',
+  current_data::text ~* '(кандидат|доктор).{0,80}наук|ph\.?[[:space:]]*d\.?',
   FALSE
 );