Disable tiny-framework-dump-test until the switch to JDK 21

Bug: 326897452
Change-Id: I7b9ab0de5038789d21cf1eb4d5beb69d698410f1
Test: TH

tools/hoststubgen/TEST_MAPPING

 {
   "presubmit": [
-    { "name": "tiny-framework-dump-test" },
+    // TODO(b/326897452): Reenable after JDK 21 switch.
+    // { "name": "tiny-framework-dump-test" },
     { "name": "hoststubgentest" },
     { "name": "hoststubgen-invoke-test" }
   ],