chore(deps): update dependency blacksheep to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
blacksheep	>=1.2,<1.3 -> >=2,<2.1

---

Release Notes

Neoteroi/BlackSheep (blacksheep)

v2.0.0

Compare Source

• Releases v2 as stable.
• Removes the route method from the Application class, and move it to the
  Router class to be consistent with other methods to register request
  handlers.
• Removes ClientConnectionPool and ClientConnectionPools aliases.

---

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.

[waghanza]

cc @RobertoPrevato