Update build requirement from ~=0.10.0 to ~=1.2.1 in /fdmlpy

Updates the requirements on [build](https://github.com/pypa/build) to permit the latest version.
- [Release notes](https://github.com/pypa/build/releases)
- [Changelog](https://github.com/pypa/build/blob/main/CHANGELOG.rst)
- [Commits](pypa/build@0.10.0...1.2.1)

---
updated-dependencies:
- dependency-name: build
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

fdmlpy/requirements.txt

@@ -1,3 +1,3 @@
-build~=0.10.0
+build~=1.2.1
 sphinx~=6.2.1
 sphinx_rtd_theme~=1.2.0