fix: bandit check error

[waketzheng]

Add exclude_dirs and nosec for bandit

Description

bandit check is no need to cover unittest code

Motivation and Context

fix make lint error

How Has This Been Tested?

make ci && make lint

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added the changelog accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[coveralls]

Pull Request Test Coverage Report for Build 9461000468

Details

• 1 of 2 (50.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 87.844%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
tortoise/backends/oracle/executor.py	0	1	0.0%
<!--	Total:	1	2	50.0%	-->

Totals
Change from base Build 9345308446:	0.0%
Covered Lines:	5779
Relevant Lines:	6481

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💛 - Coveralls