This release adds support for [Trio](https://trio.readthedocs.io/en/stable/). ✨

It upgrades the version of Starlette to `0.15.0`, now based on [AnyIO](https://anyio.readthedocs.io/en/stable/), and the internal async components in **FastAPI** are now based on AnyIO as well, making it compatible with both **asyncio** and **Trio**.

Kapica, Peng Yu, Philip Yang, Pierre Blondeau, Po-Hsien Chu, powderluv, Puyu
Wang, Rajendra Arora, Rasmus, Renat Idrisov, resec, Robin Richtsfeld, Ronald
Eddy Jr, Sahil Singh, Sam Matzek, Sami Kama, sandipmgiri, Santiago Castro, Sayed
Hadi Hashemi, Scott Tseng, Sergii Khomenko, Shahid, Shengpeng Liu, Shreyash
Sharma, Shrinidhi Kl, Simone Cirillo, simsicon, Stanislav Levental,

* Bootstrap v4.6.2 (https://getbootstrap.com/)\n * Copyright 2011-2022 The Bootstrap Authors\n * Copyright 2011-2022 Twitter, Inc.\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)\n */\n:root {\n  --blue: #007bff;\n  --indigo: #6610f2;\n  --purple: #6f42c1;\n  --pink: #e83e8c;\n  --red: #dc3545;\n  --orange: #fd7e14;\n  --yellow: #ffc107;\n  --green: #28a745;\n  --teal: #20c997;\n  --cyan: #17a2b8;\n  --white: #fff;\n  --gray: #6c757d;\n  --gray-dark: #343a40;\n  --primary:...

\"UTF-8\";\n/*!\n * Bootstrap  v5.3.0 (https://getbootstrap.com/)\n * Copyright 2011-2023 The Bootstrap Authors\n * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)\n */\n:root,\n[data-bs-theme=light] {\n  --bs-blue: #0d6efd;\n  --bs-indigo: #6610f2;\n  --bs-purple: #6f42c1;\n  --bs-pink: #d63384;\n  --bs-red: #dc3545;\n  --bs-orange: #fd7e14;\n  --bs-yellow: #ffc107;\n  --bs-green: #198754;\n  --bs-teal: #20c997;\n  --bs-cyan: #0dcaf0;\n  --bs-black: #000;\n  --bs-white: #fff;\n  --bs-gray:...