fix: check composite pk while detecting bridge table

Signed-off-by: mertmit <mertmit99@gmail.com>

packages/nocodb/src/lib/services/metaDiff.svc.ts

@@ -1010,7 +1010,7 @@ export async function extractAndGenerateManyToManyRelations(
     }
 
     // todo: impl better method to identify m2m relation
-    if (belongsToCols?.length === 2 && normalColumns.length < 5) {
+    if (belongsToCols?.length === 2 && normalColumns.length < 5 && assocModel.primaryKeys.length === 2) {
       const modelA = await belongsToCols[0].colOptions.getRelatedTable();
       const modelB = await belongsToCols[1].colOptions.getRelatedTable();