Courses Deepdive Sequence Poetry have T2T version conflicts

The problem is related to `courses/machine_learning/deepdive/09_sequence/courses/machine_learning/deepdive/09_sequence`, which is used at Coursera's Sequence Models for Time Series and Natural Language Processing, part of Advanced Machine Learning with TensorFlow on Google Cloud Platform. When one reaches the `Train model locally on subset of data` part the below commad:
```bash
%%bash
DATA_DIR=gs://${BUCKET}/poetry/subset
OUTDIR=./trained_model
rm -rf $OUTDIR
t2t-trainer \
--data_dir=gs://${BUCKET}/poetry/subset \
--t2t_usr_dir=./poetry/trainer \
--problem=$PROBLEM \
--model=transformer \
--hparams_set=transformer_poetry \
--output_dir=$OUTDIR --job-dir=$OUTDIR --train_steps=10
```
throws an error:
```bash
/usr/local/envs/py2env/lib/python2.7/site-packages/h5py/__init__.py:36: FutureWarning: Conversion of the second argument of issubdtype from `float` to `np.floating` is deprecated. In future, it will be treated as `np.float64 == np.dtype(float).type`.
from ._conv import register_converters as _register_converters
Traceback (most recent call last):
File "/usr/local/envs/py2env/bin/t2t-trainer", line 23, in
from tensor2tensor.bin import t2t_trainer
File "/usr/local/envs/py2env/lib/python2.7/site-packages/tensor2tensor/bin/t2t_trainer.py", line 25, in
from tensor2tensor import models # pylint: disable=unused-import
File "/usr/local/envs/py2env/lib/python2.7/site-packages/tensor2tensor/models/__init__.py", line 25, in
from tensor2tensor.layers import modalities # pylint: disable=g-import-not-at-top
File "/usr/local/envs/py2env/lib/python2.7/site-packages/tensor2tensor/layers/modalities.py", line 28, in
from tensor2tensor.layers import common_attention
File "/usr/local/envs/py2env/lib/python2.7/site-packages/tensor2tensor/layers/common_attention.py", line 31, in
from tensor2tensor.layers import common_layers
File "/usr/local/envs/py2env/lib/python2.7/site-packages/tensor2tensor/layers/common_layers.py", line 30, in
import tensorflow_probability as tfp
File "/usr/local/envs/py2env/lib/python2.7/site-packages/tensorflow_probability/__init__.py", line 68, in
_ensure_tf_install()
File "/usr/local/envs/py2env/lib/python2.7/site-packages/tensorflow_probability/__init__.py", line 65, in _ensure_tf_install
present=tf.__version__))
ImportError: This version of TensorFlow Probability requires TensorFlow version >= 1.14; Detected an installation of version 1.13.1. Please upgrade TensorFlow to proceed.
```
On the other hand, trying to update tensorflow in the top setup cells as explained in the exception, another issue arises:
```
tensorflow 1.14.0 has requirement numpy<2.0,>=1.14.5, but you'll have numpy 1.14.0 which is incompatible.
```
Also, as you on it, it'd be good IMO to bump the notebook's version of python up to 3, currently it's 2.