Pin the version of some dependencies for readthedoc

[oooo26]

From the building log, I find readthedoc use different version on some packages, e.g. Sphinx, compared to before.
It may cause the wrong format.

Now I pin some packages Sphinx==4.5.0, docutils==0.17.1 and sphinx-rtd-theme===1.1.1, which were worked before. This also fix #468, so I unpinned Jinja2.

[oooo26]

There seems still a problem in rendering the list and I found readthedocs/sphinx_rtd_theme#1115 .

Will update soon.

[codecov]

Codecov Report

Base: 96.22% // Head: 96.19% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (a134343) compared to base (d754e55).
Patch coverage: 90.90% of modified lines in pull request are covered.

❗ Current head a134343 differs from pull request most recent head 928364f. Consider uploading reports for the commit 928364f to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #469      +/-   ##
==========================================
- Coverage   96.22%   96.19%   -0.03%     
==========================================
  Files          28       28              
  Lines        3043     3051       +8     
==========================================
+ Hits         2928     2935       +7     
- Misses        115      116       +1     

Flag	Coverage Δ
Python	97.26% <90.90%> (-0.08%)	⬇️
rpackage	95.65% <ø> (ø)

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Impacted Files	Coverage Δ
python/abess/linear.py	98.75% <90.90%> (-0.39%)	⬇️

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[oooo26]

Sphinx==4.5.0, docutils<0.17 solved the problem.