Strata v2.0.0-alpha.115

• Upgrade interrupt to 11.0.0-alpha.25.
• Upgrade operation to 6.0.0-alpha.12.
• Upgrade writeahead to 0.0.48.
• Upgrade fracture to 0.3.0-alpha.72.
• Upgrade extant to ^2.0.0-alpha.4.
• Upgrade destructible to 7.0.0-alpha.70.
• Upgrade rescue to 7.0.0-alpha.18.
• Upgrade journalist to 0.1.30.
• Upgrade perhaps to 0.0.12.
• Upgrade turnstile to 6.0.0-alpha.81.

Closes #784.