gh-143756: skip test_ssl_in_multiple_threads under TSAN

Concurrent calls to SSLContext.load_cert_chain on the same context
race on the SSL_CTX default password callback. This is fixed in 3.15
(GH-143818), but under TSAN with instrumented OpenSSL the race is now
reported on 3.14, so skip the test that triggers it.

Author: kumaraditya303

Lib/test/test_ssl.py

@@ -3059,6 +3059,10 @@ def test_echo(self):
                 'Cannot create a client socket with a PROTOCOL_TLS_SERVER context',
                 str(e.exception))
 
+    @support.skip_if_sanitizer("gh-143756: data race in "
+                               "SSLContext.load_cert_chain when called "
+                               "concurrently on the same context",
+                               thread=True)
     @unittest.skipUnless(support.Py_GIL_DISABLED, "test is only useful if the GIL is disabled")
     def test_ssl_in_multiple_threads(self):
         # See GH-124984: OpenSSL is not thread safe.