Skip private _config context in Sidekiq 7+

[st0012]

Fixes #1956

[codecov-commenter]

Codecov Report

Base: 98.04% // Head: 98.02% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (29e0221) compared to base (dce8ef0).
Patch coverage: 40.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1967      +/-   ##
==========================================
- Coverage   98.04%   98.02%   -0.02%     
==========================================
  Files         157      157              
  Lines        9826     9831       +5     
==========================================
+ Hits         9634     9637       +3     
- Misses        192      194       +2     

Impacted Files	Coverage Δ
sentry-sidekiq/spec/sentry/sidekiq_spec.rb	94.80% <25.00%> (-1.87%)	⬇️
...entry-sidekiq/lib/sentry/sidekiq/context_filter.rb	100.00% <100.00%> (ø)
sentry-resque/lib/sentry/resque.rb	100.00% <0.00%> (+2.77%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.