Fix building against PG14.0

In timescale#7467 we added a `RelationCacheInvalidate(false)` but on upstream
this API changed on PG14.1 by postgres/postgres@dde966e.

We build agains first minor release in our nightly CI and also on ABI
tests so make sure we're using the right function call based on the
Postgres version we're building against.

https://github.com/timescale/timescaledb/actions/runs/11943958854/job/33294019881#step:12:360

tsl/src/hypercore/hypercore_handler.c

@@ -3491,7 +3491,11 @@ convert_to_hypercore_finish(Oid relid)
 	 * relcache invalidations. Previously there was sometimes a crash here
 	 * because the tuple sort state had a reference to a tuple descriptor in
 	 * the relcache. */
+#if (PG_VERSION_NUM >= 140001)
 	RelationCacheInvalidate(false);
+#else
+	RelationCacheInvalidate();
+#endif
 #endif
 
 	Chunk *chunk = ts_chunk_get_by_relid(conversionstate->relid, true);