gh-122334: Fix test_embed failure when missing _ssl module (GH-122630)

Co-authored-by: Wulian233 <1055917385@qq.com>

Lib/test/test_embed.py

@@ -465,7 +465,11 @@ class EmbeddingTests(EmbeddingTestsMixin, unittest.TestCase):
         # Test _PyArg_Parser initializations via _PyArg_UnpackKeywords()
         # https://github.com/python/cpython/issues/122334
         code = textwrap.dedent("""
+            try:
                 import _ssl
+            except ModuleNotFoundError:
+                _ssl = None
+            if _ssl is not None:
                 _ssl.txt2obj(txt='1.3')
             print('1')