style: replace usage of interface{} with any

[sahidvelji]

This PR

Replace usage of interface{} with any.
This is a stylistic update only. See issue #358 for details.

Related Issues

Fixes #358

Notes

Follow-up Tasks

How to test

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.20%. Comparing base (965e766) to head (a3fd661).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
openfeature/evaluation_context.go	83.33%	1 Missing ⚠️
openfeature/provider.go	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #362   +/-   ##
=======================================
  Coverage   88.20%   88.20%           
=======================================
  Files          14       14           
  Lines        1407     1407           
=======================================
  Hits         1241     1241           
  Misses        142      142           
  Partials       24       24           

Flag	Coverage Δ
e2e	88.20% <92.85%> (ø)
unit	88.20% <92.85%> (ø)

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