Remove unused use namespace

[peter279k]

What does this Pull Request do?

• Remove some namespaces because of useless.

What's new?

• Removing unused namespace definitions.

How should this be tested?

• There is no test for this PR.

[codecov]

Codecov Report

Merging #77 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #77   +/-   ##
=========================================
  Coverage     97.01%   97.01%           
  Complexity       12       12           
=========================================
  Files             1        1           
  Lines            67       67           
=========================================
  Hits             65       65           
  Misses            2        2

Impacted Files	Coverage Δ	Complexity Δ
src/FedoraApi.php	97.01% <ø> (ø)	12 <0> (ø)	⬇️

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