Pin grpcio-tools==1.78.0 for python 3.14

sdks/python/pyproject.toml

diff --git a/sdks/python/pyproject.toml b/sdks/python/pyproject.toml
index a0c316f..75a6b4f 100644
--- a/sdks/python/pyproject.toml
+++ b/sdks/python/pyproject.toml
@@ -25,7 +25,8 @@
     # Currently Blocked on old dependencies of Beam tft extra:
     # https://github.com/apache/beam/issues/37854
     "grpcio-tools==1.62.1; python_version <= '3.12'",
-    "grpcio-tools==1.71.0; python_version >= '3.13'",
+    "grpcio-tools==1.71.0; python_version >= '3.13' and python_version < '3.14'",
+    "grpcio-tools==1.78.0; python_version >= '3.14'",
     "mypy-protobuf==3.5.0",
     # Avoid https://github.com/pypa/virtualenv/issues/2006
     "distlib==0.4.3",