Fix contract/dependencies conflict checker

[chasefleming]

Closes #1599

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For contributor use:

• [x] Targeted PR against master branch
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• [ ] Code follows the standards mentioned here
• [ ] Updated relevant documentation
• [x] Re-reviewed Files changed in the Github PR explorer
• [x] Added appropriate labels

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 23.07692% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 39.61%. Comparing base (9d33723) to head (85cc0c2).

Files	Patch %	Lines
internal/dependencymanager/dependencyinstaller.go	23.07%	8 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1600 +/- ## ========================================== - Coverage 39.95% 39.61% -0.35% ========================================== Files 51 51 Lines 3346 3345 -1 ========================================== - Hits 1337 1325 -12 - Misses 1841 1851 +10 - Partials 168 169 +1 ``` | [Flag](https://app.codecov.io/gh/onflow/flow-cli/pull/1600/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=onflow) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/onflow/flow-cli/pull/1600/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=onflow) | `39.61% <23.07%> (-0.35%)` | :arrow_down: | 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=onflow#carryforward-flags-in-the-pull-request-comment) to find out more.

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