fix: python requirements for pytest and moto (#8769)

harness/tests/requirements/requirements-harness.txt

@@ -1,5 +1,5 @@
 # pytest 6.0 has linter-breaking changes
-pytest>=6.0.1
+pytest>=6.0.1,<8.0.0 # Versions 8.0.0 and above require Python 3.9 or above.
 mypy==0.910
 # responses 0.23.2 requires urllib3>=2, which breaks several other dependencies
 responses!=0.23.2
@@ -12,7 +12,7 @@ torchvision==0.12.0
 tensorflow==2.12.0; sys_platform != 'darwin' or platform_machine != 'arm64'
 tensorflow-macos==2.11.0; sys_platform == 'darwin' and platform_machine == 'arm64'
 attrdict3
-moto
+moto<5.0.0 # moto 5.0.0 drops mock_s3, need to replace with mock_aws
 # Pydantic V2 has changes that break existing tests
 pydantic<2
 pandas