Valid version according to https://peps.python.org/pep-0440/

Author: denismerigoux

runtimes/python/pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "catala-runtime"
 description = "Runtime libraries needed to execute Catala programs compiled to Python"
-version = "1.0.0~alpha"
+version = "1.0.0a"
 dependencies = [
   "gmpy2 ~= 2.2.0rc1",
   "typing",