Fix sentencepiece version for Python 3.11

[fujimotos]

What?

This patch fixes the version specifier for sentencepiece in setup.py.

Why?

SentencePiece adds support for Python 3.11 in v0.1.98.

https://github.com/google/sentencepiece/releases/tag/v0.1.98

Since ESPnet pins sentencepiece to v0.1.97, users with recent Python version can
see failure during installation.

Note: We received such a bug report today from a user who uses Python 3.11.5,
so proceeded to submit this patch.

See also

• @kamo-naoyuki pinned the sentence piece version to v0.1.97 in Fix sentencepice version to v0.1.97 #5107.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (96978d4) 76.12% compared to head (f94df3a) 59.71%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5532       +/-   ##
===========================================
- Coverage   76.12%   59.71%   -16.42%     
===========================================
  Files         743      742        -1     
  Lines       69126    69039       -87     
===========================================
- Hits        52622    41225    -11397     
- Misses      16504    27814    +11310     

Flag	Coverage Δ
test_configuration_espnet2	∅ <ø> (∅)
test_integration_espnet1	?
test_integration_espnet2	48.49% <ø> (ø)
test_python_espnet1	?
test_python_espnet2	52.65% <ø> (ø)
test_utils	22.15% <ø> (ø)

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[kamo-naoyuki]

Sentencepiece v0.1.98 seems to break backward compatibility.
I don't know the details of the update. Please ask someone in the know.