修改pymongo认证失败问题

[woshiyanghai]

fix https://github.com/hhyo/Archery/issues/2641

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 77.11%. Comparing base (14fbd5e) to head (97b7143).

Files	Patch %	Lines
sql/engines/mongo.py	40.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2644 +/- ## ======================================= Coverage 77.11% 77.11% ======================================= Files 117 117 Lines 16170 16171 +1 ======================================= + Hits 12470 12471 +1 Misses 3700 3700 ```

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[sunbluers]

由于mongo版本较低，需要pymongo版本适配，最终fix.

[wang-xiaowu]

该pr引起了另一个问题：

见：https://github.com/hhyo/Archery/pull/2645

[woshiyanghai]

让另一个朋友pr这里吧