[REGRESSION] fixed regression where python 3.7 could not find the pyt…

…hon `build` package. (- WIP #46 -)

Changes in file requirements.txt:
	build>=1.1.1

Changes in file setup.cfg:
	build>=1.1.1

### ChangeLog:

Changes in file setup.cfg:
 zip_safe = false

setup.cfg

@@ -40,7 +40,7 @@ python_requires = >=3.7, !=3.13.*
 setup_requires =
   setuptools>=45.0.0
   wheel>=0.37.0
-  build>=1.2.1
+  build>=1.1.1
 
 scripts =
   multicast/__main__.py