Fix format workflow failure by aligning adicts/functions.py with Black output

[Copilot]

The format job failed because black --check --target-version=py314 adicts/ detected a formatting drift in adicts/functions.py. This PR applies the exact Black-compatible formatting change so CI formatting checks can pass.

• Root cause

  • adicts/functions.py had a function signature layout that no longer matched current Black formatting rules used in CI.

• Change applied

  • Reformatted the d_multiply function definition in adicts/functions.py to Black’s expected multiline signature style.
  • No behavioral or API changes; formatting-only update.

• Representative diff

  -def d_multiply(d: Mapping[A, Numeric], dmul: Mapping[A, Numeric]) -> Mapping[A, Numeric]:
  +def d_multiply(
  +    d: Mapping[A, Numeric], dmul: Mapping[A, Numeric]
  +) -> Mapping[A, Numeric]: