Delete deprecated configuration method

[jeffwidman]

Use Sentry.configuration instead.

This was slated for removal in v5.0.0 but was accidentally left in, so removing as part of v6.0.0.

Related:

• [Plan] Version 6 #1279

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.02 🎉

Comparison is base (7764384) 83.23% compared to head (457ce47) 83.25%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2073      +/-   ##
==========================================
+ Coverage   83.23%   83.25%   +0.02%     
==========================================
  Files         119      119              
  Lines        5665     5663       -2     
==========================================
  Hits         4715     4715              
+ Misses        950      948       -2     

Impacted Files	Coverage Δ
sentry-ruby/lib/sentry/event.rb	72.15% <ø> (+0.54%)	⬆️

... and 1 file with indirect coverage changes

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[sl0thentr0py]

hey @jeffwidman thanks for this but at some point I'll make a separate PR going through all the deprecations systematically when we do the major. Closing now, sorry!

[jeffwidman]

How are you tracking not forgetting them? I opened the PR because it looked like it'd been overlooked on the last major version bump. 😃