Fix some issue reported by JET

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (4c28668) 76.24% compared to head (80f38d4) 76.33%. Report is 1 commits behind head on master.

Files	Patch %	Lines
src/deps_compat.jl	80.00%	1 Missing :warning:
src/pkg/Versions.jl	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #244 +/- ## ========================================== + Coverage 76.24% 76.33% +0.09% ========================================== Files 11 11 Lines 783 786 +3 ========================================== + Hits 597 600 +3 Misses 186 186 ``` | [Flag](https://app.codecov.io/gh/JuliaTesting/Aqua.jl/pull/244/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaTesting) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/JuliaTesting/Aqua.jl/pull/244/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaTesting) | `76.33% <80.00%> (+0.09%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaTesting#carryforward-flags-in-the-pull-request-comment) to find out more.

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