[release] Add 1.64.0 to interop tests (#36650)

grpc_interop_matrix_adhoc run - https://fusion2.corp.google.com/ci/kokoro/prod:grpc%2Fcore%2Fexperimental%2Flinux%2Fgrpc_interop_matrix_adhoc/activity/1e50bcde-9646-488e-88ae-e700a0863f71/summary

Closes #36650

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36650 from yashykt:Add164ToInterop 92a6913722
PiperOrigin-RevId: 634919389

tools/interop_matrix/client_matrix.py

@@ -133,6 +133,7 @@ LANG_RELEASE_MATRIX = {
             ("v1.61.0", ReleaseInfo()),
             ("v1.62.0", ReleaseInfo()),
             ("v1.63.0", ReleaseInfo()),
+            ("v1.64.0", ReleaseInfo()),
         ]
     ),
     "go": OrderedDict(
@@ -789,6 +790,12 @@ LANG_RELEASE_MATRIX = {
                     runtimes=["python"], testcases_file="python__master"
                 ),
             ),
+            (
+                "v1.64.0",
+                ReleaseInfo(
+                    runtimes=["python"], testcases_file="python__master"
+                ),
+            ),
         ]
     ),
     "node": OrderedDict(
@@ -886,6 +893,7 @@ LANG_RELEASE_MATRIX = {
             ("v1.61.0", ReleaseInfo()),
             ("v1.62.0", ReleaseInfo()),
             ("v1.63.0", ReleaseInfo()),
+            ("v1.64.0", ReleaseInfo()),
         ]
     ),
     "php": OrderedDict(
@@ -947,6 +955,7 @@ LANG_RELEASE_MATRIX = {
             ("v1.61.0", ReleaseInfo()),
             ("v1.62.0", ReleaseInfo()),
             ("v1.63.0", ReleaseInfo()),
+            ("v1.64.0", ReleaseInfo()),
         ]
     ),
     "csharp": OrderedDict(