Bump build from 1.0.3 to 1.2.1 in /requirements

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] <support@github.com>

requirements/requirements_build.txt

@@ -1,4 +1,4 @@
 black==24.4.2
-build==1.0.3
+build==1.2.1
 chevron==0.14.0
 wheel==0.42.0