solved issue with importing from local files

[fpgmaas]

There was an issue with imports from files in same directory begin marked as missing dependencies. For example, consider the following directory:

  dir
   - foo.py
   - bar.py

In this case, if foo.py any imports from bar.py such as 'from bar import x', this resulted in an error, since the module bar is not found in the installed modules. This MR solves that issue.

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes

[codecov-commenter]

Codecov Report

Merging #163 (22f5bae) into main (7659a91) will increase coverage by 0.0%.
The diff coverage is 100.0%.

@@          Coverage Diff          @@
##            main    #163   +/-   ##
=====================================
  Coverage   95.1%   95.1%           
=====================================
  Files         28      28           
  Lines        882     895   +13     
  Branches     133     136    +3     
=====================================
+ Hits         839     852   +13     
  Misses        28      28           
  Partials      15      15           

Impacted Files	Coverage Δ
deptry/import_parser.py	96.0% <100.0%> (+0.4%)	⬆️
deptry/compat.py	57.1% <0.0%> (ø)
deptry/core.py	97.3% <0.0%> (+<0.1%)	⬆️
deptry/dependency_getter/base.py	95.0% <0.0%> (+0.2%)	⬆️

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