Bump skylight from 4.1.2 to 4.2.1

[dependabot-preview[bot]]

Bumps skylight from 4.1.2 to 4.2.1.

Changelog

Sourced from skylight's changelog.

4.2.1 (January 14, 2020)

• [IMPROVEMENT] Enable instrumentation for ActionMailer::MailDeliveryJob
• [BUGFIX] Improved handling for non-SPEC compliant Rack middleware

4.2.0 (October 30, 2019)

• [FEATURE] Add GraphQL probe
• [FEATURE] Optionally add Rack mount point to Sinatra endpoint names
• [FEATURE] Add Skylight.mute and Skylight.unmute blocks to selectively disable and re-enable
• [IMPROVEMENT] Shut down the native instrumenter when the remote daemon is unreachable instrumentation
• [IMPROVEMENT] Revise agent authorization strategy (fixes some issues related to activation for background jobs)
• [IMPROVEMENT] Fix Rails 6 deprecation warnings
• [BUGFIX] Skip the Sidekiq probe if Sidekiq is not present

Commits

• abcd215 Add missing item to CHANGELOG
• 42385e3 Release 4.2.1
• f8c0ad3 Merge pull request #618 from tildeio/fix-grape
• 1d2e803 Lock rack version for older Grape on CI
• b051d6c Run bundle update on CI to make sure we have the latest
• c6f9123 Test Grape 1.3 on CI
• 60f12a6 Resolve issue with non-compliant Rack responses
• 122d3fb Merge pull request #612 from tildeio/mail-delivery-job
• 9a3b054 Support ActionMailer::MailDeliveryJob
• 5f2fea0 Merge pull request #587 from tildeio/release-4.2.0
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #288.