poetry: update pygls to version 0.12

[charlievieth]

Update pygls to version 0.12 to remove a conflict with
jedi-language-server which requires pygls "^0.12" and set the minimum
python version to py37 (as required by pygls 0.12).

This commit also bumps the cmake-language-server version to 0.1.36

[codecov]

Codecov Report

Merging #55 (77a6b5c) into master (4be7657) will decrease coverage by 1.70%.
The diff coverage is 93.75%.

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
- Coverage   93.75%   92.04%   -1.71%     
==========================================
  Files           5        3       -2     
  Lines         464      327     -137     
==========================================
- Hits          435      301     -134     
+ Misses         29       26       -3     

Flag	Coverage Δ
unittests	92.04% <93.75%> (-1.71%)	⬇️

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Impacted Files	Coverage Δ
src/cmake_language_server/server.py	87.28% <92.10%> (+0.73%)	⬆️
src/cmake_language_server/__init__.py	100.00% <100.00%> (ø)
src/cmake_language_server/api.py	94.60% <100.00%> (ø)

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[regen100]

Thank you for your PR!

[regen100]

And released!