[3.14] gh-134578: Mark more slow tests (GH-134579) (GH-134590)

(cherry picked from commit 77eade39f9)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Lib/test/test_json/test_recursion.py

@@ -86,6 +86,7 @@ def test_highly_nested_objects_decoding(self):
 
     @support.skip_wasi_stack_overflow()
     @support.skip_emscripten_stack_overflow()
+    @support.requires_resource('cpu')
     def test_highly_nested_objects_encoding(self):
         # See #12051
         l, d = [], {}