Allow protobuf 6.x

Author: vchudnov-g

gapic/ads-templates/setup.py.j2

@@ -34,7 +34,7 @@ dependencies = [
     "googleapis-common-protos >= 1.53.0",
     "grpcio >= 1.10.0",
     "proto-plus >= 1.22.3, <2.0.0",
-    "protobuf >= 4.25.8, <5.0.0dev",
+    "protobuf >= 4.25.8, <7.0.0",
     {% if api.requires_package(('google', 'iam', 'v1')) %}
     "grpc-google-iam-v1",
     {% endif %}

gapic/templates/setup.py.j2

@@ -42,7 +42,7 @@ dependencies = [
     "proto-plus >= 1.22.3, <2.0.0",
     "proto-plus >= 1.25.0, <2.0.0; python_version >= '3.13'",
     {# Explicitly exclude protobuf versions mentioned in https://cloud.google.com/support/bulletins#GCP-2022-019 #}
-    "protobuf >= 4.25.8, <5.0.0dev",
+    "protobuf >= 4.25.8, <7.0.0",
     {% for package_tuple, package_info in pypi_packages.items() %}
     {# Quick check to make sure `package_info.package_name` is not the package being generated so we don't circularly include this package in its own constraints file. #}
     {% if api.naming.warehouse_package_name != package_info.package_name %}

tests/integration/goldens/asset/setup.py

@@ -47,7 +47,7 @@
     "grpcio >= 1.75.1, < 2.0.0; python_version >= '3.14'",
     "proto-plus >= 1.22.3, <2.0.0",
     "proto-plus >= 1.25.0, <2.0.0; python_version >= '3.13'",
-    "protobuf >= 4.25.8, <5.0.0dev",
+    "protobuf >= 4.25.8, <7.0.0",
     "google-cloud-access-context-manager >= 0.1.2, <1.0.0",
     "google-cloud-os-config >= 1.0.0, <2.0.0",
     "grpc-google-iam-v1 >= 0.14.0, <1.0.0",

tests/integration/goldens/credentials/setup.py

@@ -47,7 +47,7 @@
     "grpcio >= 1.75.1, < 2.0.0; python_version >= '3.14'",
     "proto-plus >= 1.22.3, <2.0.0",
     "proto-plus >= 1.25.0, <2.0.0; python_version >= '3.13'",
-    "protobuf >= 4.25.8, <5.0.0dev",
+    "protobuf >= 4.25.8, <7.0.0",
 ]
 extras = {
 }

tests/integration/goldens/eventarc/setup.py

@@ -47,7 +47,7 @@
     "grpcio >= 1.75.1, < 2.0.0; python_version >= '3.14'",
     "proto-plus >= 1.22.3, <2.0.0",
     "proto-plus >= 1.25.0, <2.0.0; python_version >= '3.13'",
-    "protobuf >= 4.25.8, <5.0.0dev",
+    "protobuf >= 4.25.8, <7.0.0",
     "grpc-google-iam-v1 >= 0.14.0, <1.0.0",
 ]
 extras = {

tests/integration/goldens/logging/setup.py

@@ -47,7 +47,7 @@
     "grpcio >= 1.75.1, < 2.0.0; python_version >= '3.14'",
     "proto-plus >= 1.22.3, <2.0.0",
     "proto-plus >= 1.25.0, <2.0.0; python_version >= '3.13'",
-    "protobuf >= 4.25.8, <5.0.0dev",
+    "protobuf >= 4.25.8, <7.0.0",
 ]
 extras = {
 }

tests/integration/goldens/logging_internal/setup.py

@@ -47,7 +47,7 @@
     "grpcio >= 1.75.1, < 2.0.0; python_version >= '3.14'",
     "proto-plus >= 1.22.3, <2.0.0",
     "proto-plus >= 1.25.0, <2.0.0; python_version >= '3.13'",
-    "protobuf >= 4.25.8, <5.0.0dev",
+    "protobuf >= 4.25.8, <7.0.0",
 ]
 extras = {
 }

tests/integration/goldens/redis/setup.py

@@ -47,7 +47,7 @@
     "grpcio >= 1.75.1, < 2.0.0; python_version >= '3.14'",
     "proto-plus >= 1.22.3, <2.0.0",
     "proto-plus >= 1.25.0, <2.0.0; python_version >= '3.13'",
-    "protobuf >= 4.25.8, <5.0.0dev",
+    "protobuf >= 4.25.8, <7.0.0",
 ]
 extras = {
     "async_rest": [

tests/integration/goldens/redis_selective/setup.py

@@ -47,7 +47,7 @@
     "grpcio >= 1.75.1, < 2.0.0; python_version >= '3.14'",
     "proto-plus >= 1.22.3, <2.0.0",
     "proto-plus >= 1.25.0, <2.0.0; python_version >= '3.13'",
-    "protobuf >= 4.25.8, <5.0.0dev",
+    "protobuf >= 4.25.8, <7.0.0",
 ]
 extras = {
     "async_rest": [