chore(deps-dev): update mypy requirement from <3.0.0,>=1.11.2 to >=2.1.0,<3.0.0 in /packages/http/httpx

chore(deps-dev): update mypy requirement from <3.0.0,>=1.11.2 to >=2.1.0,<3.0.0 in /packages/http/httpx #1578