Update dependency sinon to v15.0.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sinon (source)	15.0.3 -> 15.0.4

---

Release Notes

sinonjs/sinon

v15.0.4

Compare Source

• e9042c4f
  Handling non-configurable object descriptors on the prototype (#​2508) (Carl-Erik Kopseng)

  This should essentially make decorated methods stubbable again (see #​2491)

• 430c9a60
  Remove uses of var (#​2506) (Carl-Erik Kopseng)

  Replace var with const where possible in /lib and /test.

  Modified the let codemod to be a codemod.

  Took about half an hour with --watch running

Released by Carl-Erik Kopseng on 2023-04-20.

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.