chore: change system test python version

FUTURE_COPYBARA_INTEGRATE_REVIEW=#2655 from googleapis:release-please--branches--main 4996a0b
PiperOrigin-RevId: 572363601

.kokoro/continuous/system.cfg

@@ -2,7 +2,7 @@
 
 env_vars: {
     key: "NOX_SESSION"
-    value: "system-3.11"
+    value: "system-3.10"
 }
 
 # Run system tests in parallel, splitting up by file

.kokoro/presubmit/system.cfg

@@ -3,7 +3,7 @@
 # Run system tests when test files are modified
 env_vars: {
     key: "NOX_SESSION"
-    value: "system-3.11"
+    value: "system-3.10"
 }
 
 # Run system tests in parallel, splitting up by file

noxfile.py

@@ -48,7 +48,7 @@
 ]
 UNIT_TEST_EXTRAS_BY_PYTHON = {}
 
-SYSTEM_TEST_PYTHON_VERSIONS = ["3.11"]
+SYSTEM_TEST_PYTHON_VERSIONS = ["3.10"]
 SYSTEM_TEST_STANDARD_DEPENDENCIES = [
     "mock",
     "pytest",
@@ -409,7 +409,7 @@ def prerelease_deps(session):
     session.run("py.test", "tests/unit")
 
     system_test_path = os.path.join("tests", "system.py")
-    system_test_folder_path = os.path.join("tests", "system")
+    system_test_folder_path = os.path.join("tests", "system", "vertexai")
 
     # Only run system tests if found.
     if os.path.exists(system_test_path):

testing/constraints-3.10.txt

@@ -1,10 +1,10 @@
 # -*- coding: utf-8 -*-
 # This constraints file is required for unit tests.
 # List all library dependencies and extras in this file.
-google-api-core==1.32.0
-proto-plus==1.22.0
-protobuf==3.19.6
+google-api-core
+proto-plus
+protobuf
 mock==4.0.2
 google-cloud-storage==2.0.0
 packaging==20.0 # Increased for compatibility with MLFlow
-grpcio-testing==1.34.0
+grpcio-testing==1.34.0