Add grpc-java 1.63.1 to client_matrix.py (#36651)

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Closes #36651

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36651 from sergiitk:java-1.63.1 409d48e1fb
PiperOrigin-RevId: 634815551

tools/interop_matrix/client_matrix.py

@@ -441,7 +441,7 @@ LANG_RELEASE_MATRIX = {
             ("v1.59.1", ReleaseInfo()),
             ("v1.60.1", ReleaseInfo()),
             ("v1.61.0", ReleaseInfo()),
-            ("v1.63.0", ReleaseInfo()),
+            ("v1.63.1", ReleaseInfo()),
             ("v1.64.0", ReleaseInfo()),
         ]
     ),