dependency: bump sentry-rails from 4.6.4 to 4.6.5

Bumps sentry-rails from 4.6.4 to 4.6.5.

Changelog

Sourced from sentry-rails's changelog.

4.6.5

• SDK should drop the event when any event processor returns nil #1523
• Add severity as sentry_logger's breadcrumb hint #1527
• Refactor sentry-ruby.rb and add comments #1529

Commits

• a50bf1f release: 4.6.5
• 8d3ce47 Refactor sentry-ruby.rb and add comments (#1529)
• a1f1dbc SDK should drop the event when any event processor returns nil (#1523)
• d050286 Add severity as sentry_logger's breadcrumb hint (#1527)
• 1a47151 Merge branch 'release/4.6.4'
• See full diff in compare view

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