[interop] Add v1.61.2 release of grpc-go to interop matrix (#36252)

Closes #36252

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36252 from arvindbr8:go_release_1.61.2 d5e69b79b5
PiperOrigin-RevId: 623169766

tools/interop_matrix/client_matrix.py

@@ -296,7 +296,7 @@ LANG_RELEASE_MATRIX = {
             ("v1.58.3", ReleaseInfo(runtimes=["go1.19"])),
             ("v1.59.0", ReleaseInfo(runtimes=["go1.19"])),
             ("v1.60.1", ReleaseInfo(runtimes=["go1.19"])),
-            ("v1.61.0", ReleaseInfo(runtimes=["go1.19"])),
+            ("v1.61.2", ReleaseInfo(runtimes=["go1.19"])),
             ("v1.62.2", ReleaseInfo(runtimes=["go1.19"])),
             ("v1.63.0", ReleaseInfo(runtimes=["go1.19"])),
         ]