Restrict tox to be in 3.x version (#24601)

* Restrict tox to be in 3.x version

* remove redundant comments

* Pin version to tox

Author: AnandInguva

.github/workflows/python_tests.yml

@@ -117,7 +117,7 @@ jobs:
         working-directory: ./sdks/python
         run: pip install -r build-requirements.txt
       - name: Install tox
-        run: pip install tox
+        run: pip install tox==3.27.1
       - name: Run tests basic unix
         if: startsWith(matrix.os, 'ubuntu') || startsWith(matrix.os, 'macos')
         working-directory: ./sdks/python

sdks/python/setup.py

@@ -228,8 +228,6 @@ def get_portability_package_data():
           'apache_beam/utils/windowed_value.py',
       ]),
       install_requires= protobuf_dependency + [
-        # Avro 1.9.2 for python3 was broken.
-        # The issue was fixed in version 1.9.2.1
         'crcmod>=1.7,<2.0',
         'orjson<4.0',
         # Dill doesn't have forwards-compatibility guarantees within minor