fix terminal output when only a single file is scanned

[fpgmaas]

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]

Codecov Report

Merging #372 (26b856a) into main (e3608e5) will not change coverage.
The diff coverage is 100.0%.

@@          Coverage Diff          @@
##            main    #372   +/-   ##
=====================================
  Coverage   96.6%   96.6%           
=====================================
  Files         37      37           
  Lines       1040    1040           
  Branches     207     207           
=====================================
  Hits        1005    1005           
  Misses        22      22           
  Partials      13      13           

Impacted Files	Coverage Δ
deptry/imports/extract.py	100.0% <100.0%> (ø)