pymongo4.x支持mongodb3.6低版本

[gaoqiang-0327]

按照https://github.com/hhyo/Archery/pull/2644 修改后报错：

我的mongodb版本为3.6.22，修改后可以正常连接。

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 77.13%. Comparing base (24f86de) to head (632a93f). Report is 38 commits behind head on master.

Files with missing lines	Patch %	Lines
sql/engines/mongo.py	50.00%	3 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2645      +/-   ##
==========================================
- Coverage   77.13%   77.13%   -0.01%     
==========================================
  Files         117      117              
  Lines       16169    16176       +7     
==========================================
+ Hits        12472    12477       +5     
- Misses       3697     3699       +2     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[wang-xiaowu]

测试可行 (๑•̀ㅂ•́)و✧

[LeoQuote]

稍等我有空给你补一点单元测试就merge, 有急需的可以直接用 pr 分支的代码

[huangsijun17]

我的mongo 7.0也有 #2641 的错误，这可能不是mongdb3.6的兼容性问题。