remove starlette from dependencies and bump fastapi (#151)

fix table of contents

Bump starlette in /{{cookiecutter.project_slug}}/backend (#88)

Bumps [starlette](https://github.com/encode/starlette) from 0.13.4 to 0.13.6.
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](encode/starlette@0.13.4...0.13.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Bump starlette in /{{cookiecutter.project_slug}}/backend (#88)

Bumps [starlette](https://github.com/encode/starlette) from 0.13.4 to 0.13.6.
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](encode/starlette@0.13.4...0.13.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>