Bump build from 1.0.3 to 1.2.1

Bumps [build](https://github.com/pypa/build) from 1.0.3 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@1.0.3...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]>

requirements_test.txt

@@ -1,6 +1,6 @@
 ruff==0.3.0
 black==23.12.1
-build==1.0.3
+build==1.2.1
 coverage==7.4.0
 pytest==8.0.2
 pytest-cov==4.1.0