Bump sinatra from 3.0.5 to 3.0.6

[dependabot[bot]]

Bumps sinatra from 3.0.5 to 3.0.6.

Changelog

Sourced from sinatra's changelog.

3.0.6 / 2023-04-11

• Fix: Add support to keep open streaming connections with Puma #1858 by Jordan Owens

• Fix: Avoid crash in uri helper on Integer input #1890 by Patrik Ragnarsson

• Fix: Rescue RuntimeError when trying to use SecureRandom #1888 by Stefan Sundin

Commits

• 516ee3b 3.0.6 release (#1893)
• fb76534 Bump action-discord to v4 (#1909)
• 8ec83e3 Use action-discord v3: the fixed ruby version (#1908)
• 066149b Revert "Test build failure on main" (#1905)
• c1394c5 Fix main branch condition (#1907)
• 42bda7d Fix workflow condition on main branch (#1906)
• 29f3946 Test build failure on main (#1904)
• 313e6a2 Add action-discord notifications to main (#1903)
• c0ee2c3 Rename master branch to main (#1894)
• 89dd6f2 CI: remove redundant Puma job (#1898)
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like sinatra is up-to-date now, so this is no longer needed.