Bump solargraph from 0.39.15 to 0.39.16

Bumps solargraph from 0.39.15 to 0.39.16.

Commits

• 4b1c7f3 String.new core fill.
• c7de7d4 Revert test suite.
• 468d1f5 Add typed checking to tests.
• 90c059c Array and Hash core fills.
• 13611ae Type fix.
• 6b68f1b Type fixes.
• 22dd57c Chains infer from multiple variable assignments
• 16e359b Minor linting.
• 0052bd0 Resolve included namespaces with conflicts.
• be66f03 Parse args from YARD method objects.
• Additional commits viewable in compare view