fix: update .spi.yml target names after CosmoSQLClient rename

Old names (SQLNioCore, MSSQLNio, PostgresNio, MySQLNio, SQLiteNio) no
longer exist. Updated to current target names so Swift Package Index
can build documentation correctly.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: vkuttyp

.spi.yml

@@ -2,10 +2,10 @@ version: 1
 builder:
   configs:
     - documentation_targets:
-        - SQLNioCore
-        - MSSQLNio
-        - PostgresNio
-        - MySQLNio
-        - SQLiteNio
+        - CosmoSQLCore
+        - CosmoMSSQL
+        - CosmoPostgres
+        - CosmoMySQL
+        - CosmoSQLite
       swift_version: "6.0"
       platform: macosSpm