Bump build from 1.1.1 to 1.2.1 (#404)

Bumps [build](https://github.com/pypa/build) from 1.1.1 to 1.2.1.
- [Release notes](https://github.com/pypa/build/releases)
- [Changelog](https://github.com/pypa/build/blob/main/CHANGELOG.rst)
- [Commits](pypa/build@1.1.1...1.2.1)

---
updated-dependencies:
- dependency-name: build
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 -e .
-build==1.1.1
+build==1.2.1
 docutils==0.20.1
 mypy==1.4.1; implementation_name=="cpython"
 pre-commit==2.21.0