Chores to support newer elixir/otp versions (1.18/27+)

[zblanco]

• Updates dependencies w/ warning fixes
• Charlist syntax from '...' to ~c"..."
• OTP 27 changed internal string representation (440 → 456 bytes)
• Looks like map iteration order broke many of the doc tests requiring an Enum.sort/1 to pass with compatibility
  • Sorts are edge_meta fetched from the :edges map so shouldn't impact performance too much but might need to compare
  • It might be preferred to update these doc tests and drop support for older elixir versions
• Some elixir/otp versions previously referenced in CI aren't available so are replaced with known sets